contaminate

不良朋友圈可能会污染年轻人的价值观。

Bad company can ___contaminate young people's values.

这些暴力电影可能会污染青少年的思想。

These violent movies may ___contaminate teenagers' minds.

不要用脏手碰食物，这样会污染它。

Don't touch the food with dirty hands, as it will ___contaminate it.