1. an exchange produced by the chemical action of radiant energy (especially light). 
   在辐射（特别是可见光）能量作用下发生的取代反应。
2. If you agree to our proposal of a barter trade, we will give you chemical fertilizer in exchange for your wheat. 
   如果你方同意易货贸易的建议，我主将用化肥与你方交换小麦。
3. New chemical compound produced by chemical reaction 
   （化学反应的）生成物
4. anomaly of chemical geography 
   化学地理异常
5. automatic chemical agent alarm 
   毒剂报警器

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• 1. 化学交换
  CER阳离子交换树脂...chemical exchange化学交换...circuit switching电路交换
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