My hard work was nullified due to my carelessness.

由于粗心，我所有的努力都白费了。

Many countries nullified the death penalty.

很多个国家都废除了死刑。

These surface charges partially nullified the effect of the charges on the metal plates.

这些表面电荷部分抵消了金属板上电荷的影响。

Some people urged to nullify the penalty law. They think it's cruel.

很多人呼吁废除死刑 他们认为太残忍了

I guess they sort of nullify each other, or something.

我想他们这是在忽略对方（使对方说的话无效）或者什么的

A missing or illegible name will nullify your vote.

遗漏或字迹难以辨认的名字会使你的投票无效。

Judges were unwilling to nullify government decisions.

法官们不愿废止政府决定。

An unhealthy diet will nullify the effects of training.

不健康的饮食会抵消锻炼的效果。

They knew the courts could nullify the marriage before the ink was dry.

他们知道法庭可以在签订婚约的墨汁未干之前，宣布婚姻无效。

They have no right to nullify laws.

他们无权废除法律。