toxicant

Factories must be careful not to release toxicants into the river.

用法提示：toxicant 作名词，此处用复数 toxicants 表示多种有毒物质。

The lab tested the new cleaning product for any toxicant.

用法提示：动词 tested 的宾语 toxicant 为单数名词，表示一种有毒物质。

Scientists studied the toxicant found in the old paint.

用法提示：toxicant 作名词，后接过去分词短语 found in the old paint 作定语。