添加过多的防腐剂会破坏食品的营养价值。

Adding too many preservatives can ___vitiate the nutritional value of the food.

文件上的签名不完整可能会导致整个合同无效。

An incomplete signature on the document could ___vitiate the entire contract.

不良的同伴关系可能会逐渐败坏年轻人的品德。

Bad company can slowly ___vitiate a young person's character.