至少从达尔文时代开始，生物学家就一直在试图理解和定义物种形成的机制。

Since at least Darwin time, biologists have been trying to understand and define the mechanisms for speciation.

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新的动力机械和人工肥料现在已经完全改变了从石器时代开始的一种生活方式。

New power machinery and artificial fertilizers have now totally transformed a way of life that started in the Stone Age.

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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》

Some of the sites that are said to be destroyed by Joshua and the Israelites weren't even occupied in this period, ; the late Bronze Age, beginning of the Iron Age; the Iron Age begins around 1200.

据说一些遗址已被破坏,被约书亚，以色列在那时还未被攻占，在铜器时代晚期，铁器时代的初始;,接触器时代自1200年左右开始。

耶鲁公开课 - 旧约导论课程节选

By the time we get to Woolf in the early part of the twentieth century, Milton has come to be associated with essentially all of these ways of thinking about power, however contradictory they are.

到了20世纪早期伍尔夫的那个时代，人们开始将弥尔顿与所有思考力量,的方式相联系，不管这些方式是多么互相矛盾。

耶鲁公开课 - 弥尔顿课程节选

And everybody started to possess at least one language when they were a child.

每个人从儿童时代开始,便至少掌握了一种语言

耶鲁公开课 - 心理学导论课程节选