“失效”造句
要记住的是，一旦结婚，原遗嘱自动
失效。
It is worth remembering that previous wills are nullified automatically upon marriage.
现在签订的合同可能在将来的某一天就会
失效。
A contract signed now might be invalidated at some future date.
酒精能使药物
失效。
Alcohol negates the effects of the drug.