As you suggested, the fish contains a toxic substance.

正如你提出过的那鱼含有毒性物质。

How should we tackle toxic substance contained in food?

面对食物中的有毒物质，我们应该怎么做？

Automobile exhaust tetraethyl lead is a highly toxic substance.

汽车尾气中的四乙基铅是剧毒物质。

Identification standards for hazardous wastes-Identification for toxic substance...

危险废物鉴别标准毒性物质含量鉴别。

PETA will help pay your $50,000 bill for substance addiction treatment if you'll rid yourself of one more toxic substance: meat.

PETA将支付入院期间50000美元的费用，只要你愿意放弃另外一项更不健康的物质：肉类。