有一些变暖是自然发生的。随着上一个冰河时代的结束和冰的融化，我们已经经历了长达20，000年的变暖过程。

Part of the warming is natural; we have experienced a 20,000-year-long warming as the last ice age ended and the ice melted away.

youdao

皇帝驾崩标志着该国历史上一个时代的结束。

The death of the emperor marked the end of an epoch in the country's history.

《牛津词典》

一个时代的结束是以另一个时代开始为前提的。

The end of an era presupposes the start of another.

《柯林斯英汉双解大词典》

And, at one point in time, he laments the end of the old Latin world and the B.C. world, when people could have these child slaves.

在某一时刻，他为拉丁时代和公元前时代的结束而哀悼，那时人们可以拥有小孩做奴隶。

耶鲁公开课 - 1945年后的美国小说课程节选