化学

• These substances include many commonly used chemicals .
  这些物质包括许多常用的化学品。
• Chemical thinners add another to the arsenal of sprays .
  化学疏除剂已列入农药的宝库中。
• These chemicals are difficult to remove from water .
  要从水中清除这些化学物质是困难的。
• Chemical constantly circulate or recycle in the system .
  化学物质在系统中不断循环或回流。
• Part i is concluded by a detailed chapter on stereochemistry .
  第一部分有详述立体化学一章。
• There are some defects that leave the stoichiometry unaffected .
  有些缺陷并不影响化学计量。
• Growers must be prepared to use a range of chemicals .
  栽培者必须准备使用一系列的化学药剂。
• Juvenility cofactors have been identified as terpenes .
  幼年辅助因子已经鉴定出是萜类化学物。
• Oxygen is often used as reactant in chemical processes .
  在化学过程中，氧气经常充当为反应物。
• Attention should be given to recovery and reuse of chemicals .
  应当注意化学品的回收和再利用。