1. 先驱：恶意软件事件表征有两种:恶意软件先驱(precursor)和迹象 (indication),所谓先驱是指恶意软件攻击可能会在将来出现. 迹象是指是指已经出现或是正在出现的表征. 确认感染系统的实体地址的难处有几个因素. 在一个管理良好的网络环境中,

2. 前体物：一般都用mRNA上3个连续核苷序列表示某一野生型菌株因发生基因突变而丧失合成一种或几种生长因子(碱基或氨基酸)的能力,只有从周围环境或培养基中获得这些营养或其前体物(precursor)才能正常生长繁殖的变异类型,称为营养缺陷型.

3. 前驱物：已有研究显 已有研究显 已有研究显 已有研究显 示心房早期收缩是心房颤动之前驱物 (Precursor) 示心房早期收缩是心房颤动之前驱物 (Precursor) 示心房早期收缩是心房颤动之前驱物 (Precursor) 示心房早期收缩是心房颤动之前驱物

1. Old North Point built in 1907, Shanghai Railway Station is the precursor to the country one of the oldest railway station.
    老北站于1907年始建，是铁路上海站的前身，也是全国历史最悠久的铁路站之一。

2. An increase in rumors. A stock you are fried, and suddenly this friend came to you certain information, that friends tell you so and so the news...... This is the main precursor to ship, why not before the news?
    传言增多。一只股票你正在炒着，突然这个朋友给你传来某某消息，那个朋友也给你说某某消息……这就是主力出货的前兆，为什么之前没有消息呢？

3.

3. The comparative investigation of the characteristics of deformation and AE were conducted and the results are presented as followed: 1. The characteristics of rock AE are correlated to the strength, joints, cracks, and the size and hardness of crystalline grain. 2. The sequence of AE can be divided into four phases: beginning phase, tempestuousness phase, drop phase and dreariness phase. The loss and the duration of the phases are correlated to the rock character and flaws in the rock. 3. The AE rate characteristics are not almost concordant with the AE energy rate. 4. Besides the homogeneity, the strength of rock contributes the activity of AE. The higher the strength is, the lower the activity is. 5. There is a dreariness phase before the failure of most kinds of rock. 6. Whether the precursor is obvious is correlated to rock the character, and the precursor of AE rate is more apparent than the precursor of AE energy rate comparatively.
    通过对比研究这六种不同岩石的变形和声发射特征发现，岩石声发射受到岩石强度、节理裂隙和晶粒软硬大小等的影响；岩石声发射过程存在初始区、剧烈区、下降区和沉寂区，各个阶段是否存在及持续时间与岩石强度、内部缺陷等有关；岩石的声发射事件率特征与能量率特征并不完全一致；岩石的声发射活性除了受其均匀性影响外，还受到岩石的强度影响，强度越小，声发射活性越强；大多数岩石破坏前存在一声发射沉寂区；岩石的破坏前兆是否明显跟岩性有关，相比较而言，岩石破坏时的声发射率前兆比声发射能量率前兆更为明显一些。

4. Question 3: Kernicterus precursor period, the availability of after-effects?
    问题3：核黄疸前驱期，有无后遗症？

5. precursor的近义词

5. A novel catalyst for the copolymerization of CO2 and cyclohexene oxide was prepared by using zinc acetate anhydrous, aluminum isopropoxide and precursor N, N`-bis(2, 6-diisopropylphenyl)-2, 4-ethyldiimine Comparing with other similar catalytic systems prepared with diethyl zinc, it is of low cost and easy to handle The resulted copolymers were characterized by IR and NMR.
    用α二亚胺型BDIE配体 N，N'-(2，6-二异丙基苯基乙二亚胺与氧联锌铝醇盐以配位的方式制备了高位阻催化体系BDIE·，并催化二氧化碳与氧化环己烯共聚。

6. Under the optimum concentration of 1.5% glycerol in fermentation medium and feeding of 1% glycerol as precursor after 60 h of incubation, the titer of 2, 668 μg/ml was obtained in shake flask culture, an increase of 7.4 times compared with the original strain.
    以XC-5-48菌株为试验菌株，当培养基中甘油初始浓度为1.5%，并且在发酵60h时补加1.0%的甘油，摇瓶发酵的效价可达2668μg/ml，较出发菌株(318μg/ml)提高了7.4倍。

7. On the optimum conditions a natamycin production of 6.87g/L could be reached in the shake flask culture after 120 h cultivation, which was 84.7% higher than that of cultivations without precursor addition.
    在此条件下摇瓶分批发酵生产纳他霉素的产量可达到6.87g/L，比未添加前体的纳他霉素产量(3.72g/L)提高了84.7%。

8. The structures and properties of the precursor polymer of poly(2, 5-thienylene vinylene) synthesized in water or in methanol-water mixture were studied.
    对在水和甲醇－水混合介质中合成的聚噻吩乙炔前聚物的结构和性能进行了研究。

9. A low-cost organic compound comprising mainly polyarylate was selected as precursor and a chemical activation method was used to prepare an activated carbon material of large surface area, with which the activated carbon electrodes of high specific capacitance were fabricated for supercapacitor.
    考察了活化温度对活性炭电极比电容量的影响，研究了活性炭材料的比表面积和孔结构与活性炭电极的充放电性能之间的关系，并对活性碳电极进行了电化学表征。

10. Since the establishment of the company, technology and innovation as a precursor to the trade philosophy, has a group of domestic senior technical staff, committed to the advancement and improvement of products.
    公司自成立以来，以技术创新为先导的贸易理念，拥有一批国内高级技术人员队伍，致力于产品的提高和改善。

11. When methoxyethanol was used as the solvent, tantalum ethoxide can be chemically modified with acetic acid to producetantalum alkxo-acylate precursor, and therefore the hydrolysis of 〓can be slowed down.
      在以乙二醇单甲醚为溶剂时，乙醇钽与醋酸作用生成乙醇钽的乙酰基配位化合物，可以减弱水解反应的进行。

12. precursor是什么意思

12. Sequence homology analysis revealed that Shimen strain had the highest homology with Japanese strains (ALD and GPE-), and slightly lower homology with other three CSFV strains. Shimen strain had also significant homology with two BVDV strains (NADL and SD-1). The deduced amino acid sequence homology of Shimen strain with five CSFV and two BVDV strains was all upper than 90%. It is further confirmed that this fragment is the most conserved in pestivirus amino acid sequence. It is consistent with its essential function in replication and translation of virus genome and in processing of polyprotein precursor.
      序列同源性比较表明，石门株与日本的ALD和GPE-株同源性最高，与其它3株猪瘟病毒(C株、Brescia株和Alfort株)的同源性也很高，并与2株牛病毒性腹泻病毒(NADL株和SD-1株)也有较高的同源性，尤其是由核苷酸序列推导的氨基酸序列，同源性均大于90%，是瘟病毒属基因组中最保守的区段，这与该基因产物在病毒复制及聚蛋白前体加工过程中所具有的重要功能是一致的。

13. Ozone or potassium permanganate also had good efficiency on algae removal, and precursor as well.
      臭氧、高锰酸钾也有很好的杀藻效果和前体物去除效果。

14. The appearance of brown or black spots on brass layer was a corrosion precursor of material matrix.
      分析了小五金产品滚镀黄铜层易产生棕黑斑点的原因，论述了黄铜层出现棕黑斑点是零件基材腐蚀的开始。

15. precursor什么意思

15. Lameller mesostructured bismuth oxychloride was fabricated by hydrothermal method in a strong acidic (PH＜1) media, with hexadecylamine as the template and bismuth chloride as precursor.
      以中性表面活性剂十六胺为模板，无水三氯化铋为前体，在强酸性(PH＜1)介质中合成了层状相介孔氯氧化铋。

16. /u0039/u0031/u0031/u67E5/u8BE2/u00B7/u82F1/u8BED/u5355/u8BCD

16. Geothermal area; Anomaly analysis; Maximum entropy spectrum and band-pass filtration method; Information of seismo-geothermal precursor
      地热区；异常分析；最大熵谱和带通滤波法；地热地震前兆信息

17. precursor

17. By using in situ UV—Vis spectroscopic technique for ethylene polymerization under atmospheric pressure, three catalvtic systems with different iron or cobalt complexes as catalyst precursor were studied. The corresponding complexes are 2, 6-bis[1-(2, 6-dimethylphenylimino)ethyl]pyridine iron dichloride, 2, 6-bis[1-(2, 4, 6-trimethylphenylimino)ethyl]pyridine iron dichloride and 2, 6-bis[1-(2, 6-diisopropylphenylimino)ethyl] pyridine cobalt dichloride.
      利用乙烯常压聚合原位紫外-可见光谱技术，对3个铁、钴络合物作为催化剂前体的催化剂体系进行了研究。3个铁、钴络合物分别为2 ，6双-[1-(2 ，6-二甲基苯基亚胺)乙基]吡啶二氯化铁、2 ，6-双[1(2，4，6-三甲基苯基亚胺)乙基]吡啶二氯化铁和2，6-双 [1-(2，6-二异丙基苯基亚胺)乙基]吡啶二氯化钴。

18. Methods Temperature, pH and precursor are super factors in hydrothermal method, these existing problems are analyzed.
      从温度，pH值，前驱物等方面对水热法工艺过程中存在的问题进行了分析，提出了一些改进意见。

19. precursor的意思

19. Arginine, a NO precursor, reduced the contractile amplitude and end diastolic cell length in the cardiomyocyte, but reversibly increased LVDP, 眃P/dtmax and coronary flow in isolated perfused rat heart.
      －Arp预处理，再行Fe－HQ（5卜mol／L）灌流，与单纯的LAfg或Fe－HQ组相比，心肌细胞舒张期细胞长度、收缩幅度和速度减小；离体灌流心脏LVDP、tdP／im.x、心率和冠脉流量明显下降，冠脉流出液中LDH、CK增加。

20. On calcination, the precursor powders were converted to crystalline yttrium gadolinium oxide at 600℃.
      先驱物在600℃煅烧后可以得到立方晶型的YGO粉体。

1. 先驱；先锋；前身
    A precursor of something is a similar thing that happened or existed before it, often something which led to the existence or development of that thing.

    e.g. Real tennis, an ancient precursor of the modern game, originated in the eleventh century...
           室内网球，现代网球运动的古老前身，起源于11世纪。
    e.g. He said that the deal should not be seen as a precursor to a merger.
           他说该笔交易不应该被看作是合并的前兆。

1. something that precedes and indicates the approach of something or someone

    Synonym: harbinger forerunner predecessor herald

2. a person who goes before or announces the coming of another

    Synonym: forerunner

3. a substance from which another substance is formed (especially by a metabolic reaction)