vitiate

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.

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.

一句冒犯性的话就能破坏一场本来富有成效的会议的氛围。

A single offensive remark can ___vitiate the atmosphere of an otherwise productive meeting.