to nullify a contract
取消
同
；取消
或避免;
除，止;to nullify a contract
取消同
to nullify an agreement
把
nullify one's efforts
使某人徒劳
judges were unwilling to nullify government decisions.
法官们不愿意否定政府决策的法性。
insulin can block the release of the hormone and thereby nullify the effects of training.
胰岛素能阻碍激素的释放，从而抵消训练的效果。
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