contaminate

Chemicals from the factory began to contaminate the local river, killing many fish.

(Chinese) 工厂排出的化学物质开始污染当地河流，导致大量鱼类死亡。

One person with a virus can contaminate an entire kitchen if they don't wash their hands.

(Chinese) 如果不洗手，携带病毒的人可能会污染整个厨房。