The hotel used to release all its cooking oil waste into the environment.

该酒店过去常将其全部的废弃食用油排放到环境中。

Most of the businesses used to pour all their oil waste into drain pipes.

大多数企业过去都是将所有的废油直接倒进排水管。

The hotel used to release all its cooking oil waste into the environment. But officials were concerned about the harmful effects this was having.

酒店过去把所有的食用油废料都排放到环境中。但管理人员担心这会产生有害影响。