food chain

Humans occupy the top of the food chain and are affected by toxins that accumulate at each level.人类占据了食物链的顶端，并受到在每一级中富集的毒素的影响。

Disrupting any link in the food chain can have cascading consequences throughout an ecosystem.破坏食物链中的任何一个环节都会对整个生态系统产生连锁反应。