实际上不是这样，因为有一部分污泥不能为生物所降鲜。

In practice this is not the case since part of the sludge is not biodegradable.

youdao

实际上不是这样，因为有一部分污泥不能为生物所降鲜。

In practice this is not the case since part of the sludge is not biodegradable.

youdao