英汉词典

1.The problem is that competition ordinarily cannot be observed directly but must be inferred from the spread or increase of one species and the concurrent reduction or disappearance of another species.

问题是，人们通常不能直接观察竞争，而必须从一个物种的扩展或增加和同时另一个物种的减少或消失来推断。

2.Her disappearance has never been satisfactorily explained.

她的失踪一直没有得到令人信服的解释。

3.The disappearance of the wolves had many unexpected results.

狼的消失带来了许多意想不到的结果。

4.The event is to help people to pay attention to the disappearance of the world's languages, many of them are disappearing each year.

该活动旨在帮助人们关注世界语言的消失，它们之中大多数每年都在消失。

5.The disappearance of megafauna in America—mammoths, saber-toothed cats, giant sloths, among others—happened relatively soon after the arrival of human beings, about 13,000 years ago.

美洲巨型动物的消失——猛犸象、剑齿猫、巨型树懒等等——发生在人类出现后不久，大约在一万三千年前。

6.The disappearance of dinosaurs is not necessarily caused by astronomical incidents.

恐龙的消失并不一定是由天文事件引起的。

7.And perhaps a disappearance.

很可能是一桩失踪案。