为了保证最后产品的纯度，对起始物质应当建立一个适当的杂质限度。
Appropriate limits should be set in the specifications of the starting material, in order to ensure appropriate purity of the final substance.
氨是其它氮化合物(尤其是硝酸盐和亚硝酸盐)的起始物质，这些化合物主要用于农业肥料和炸药。
Industrially, ammonia is the starting material for most other nitrogen compounds (especially nitrates and nitrites), whose main USES are in agricultural fertilizers and explosives.
它可以代替剧毒的光气和硫酸二甲酯作为环境友好的有机合成中间体和起始物质，应用与羰基化和甲基化反应中。
It can be use as an environment-friendly intermediate and starting material for organic synthesis substituting the poisonous phosgene and dimethyl sulfate in carbonylation and methylation reaction.
如果你允许思维演化为可分割的物质，那是否就意味着，你在此已经拥有可分割物质，诸如变形虫和其他一些微生物作为起始呢？
If you're going to allow a mind to evolve as a separate substance does it mean you've got to have a separate substance right there at the start, amoebae and so on and some microbes?
从多重来源的起始原料的定量分析和起始原料中的相关物质对药物中的相关物质的影响在本文中也通过具体例子进行了讨论。
Quality assessment of starting materials from multiple sources and the impact of starting material impurities on the impurity profile of the drug substance are discussed with illustrative examples.
在起始阶段以体育的物质文化(体育项目)的传播为主要特征。
The main characteristic of the initial development stage is the communication of sports material culture (sports events).
结果表明：在培养起始阶段，强还原性有机物质的数量迅速增加，以后逐渐下降。
The results showed that the strongly organic reducing substances increased rapidly at the initial stage of anaerobic culture, and then decreased gradually.
介绍了作为粘度起始标准物质的纯水的粘度，各个时期国际上所采用的值及这两年ISO关于采用新值的决定。
The viscosity of pure water, the original reference material for viscosity, is introduced. The values adopted in different times and the decision for new value by ISO in recent years are presented.
结论P物质及其受体参与了小鼠免疫性肝炎的起始阶段，并在炎症的激发和扩大方面发挥了重要作用。
Conclusion SP and its receptor participate in the process of inflammatory liver injury induced by Con a and play an important role in induction and maintenance of inflammation.
结论P物质及其受体参与了小鼠免疫性肝炎的起始阶段，并在炎症的激发和扩大方面发挥了重要作用。
Conclusion SP and its receptor participate in the process of inflammatory liver injury induced by Con a and play an important role in induction and maintenance of inflammation.
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