1. necessary product and surplus product 
   必要产品与剩余产品
2. A substance formed as a necessary stage in the manufacture of a desired end product. 
   中间产物在生产预计的最终产品的必需阶段中形成的物质
3. To request return(of a product) to the manufacturer, as for necessary repairs or adjustments. 
   主动收回，调回工厂因必要的修理或调试等原因而主动要求将（某个产品）回收到制造者手中
4. Be it necessary for us to open an l/c at sight for the finished product? 
   制成品的支付必须开出即期信用证吗？
5. any substance involved in metabolism (either as a product of metabolism or as necessary for metabolism). 
   新陈代谢中的任何物质（新陈代谢的产物或必须物）。

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