foreign substance

• 杂质

foreign substance的用法和样例：

例句

1. Milk is put through a clarifier to remove any foreign matter.
   牛奶要经过一个澄清器来除去杂质。
2. The major problem in fabrication is the control of contamination and foreign materials.
   制造中的一个主要问题是如何控制沾染和杂质。
3. The foreign matters mainly come from the green coffees which are dry processed and dried on floors.
   该等外来物质一般是因为干处理咖啡生豆是在晒场地上晒干时混入的。
4. Avoid damaging effects of foreign matter in the flow by using a strainer ahead of the valve.
   为了避免外来物质的破坏作用，要在阀门前面采用一个过滤器。

词汇搭配

• foreign body 夹杂物,外来物体...