他们的笑声渐渐消失了。

The sound of their laughter died away.

《牛津词典》

黑色的小汽车驶离了他们便消失了。

The black car drove away from them and disappeared.

《柯林斯英汉双解大词典》

无论如何，他们现在都消失了；我有他们的步枪。

They've all disappeared by now, one way or another; and I've got their rifles.

youdao

It turns out that if you make them forfeit their cash value on canceling, then they won't cancel.

但是如果你规定保单的现金价值,会随保单的取消而消失,他们就不会这么干了

耶鲁公开课 - 金融市场课程节选

And then perhaps the right thing to say is the person no longer exists, so they no longer exist as a person, even if the body is still alive.

也许正确的说法应该是,这个人已经不存在了，他们作为人的身份已经消失，即便肉体还是活着的。

耶鲁公开课 - 死亡课程节选