primary sludge

• 生污泥,原污泥

primary sludge的用法和样例：

例句

1. Sludge incineration is a frequently employed disposed method.
   污泥焚烧也是一种常用的处置方法。
2. Fluid sludge can be sold to farmers for spreading on their fields.
   液态污泥可以出售给农民，洒布在农田里。