自从一万年前农业开始发展以来，已有三分之一的树木被砍伐殆尽。

As much as a third of the total tree cover has been lost since agriculture began some 10,000 years ago.

youdao

一旦语言从2岁左右开始发展，他们就有了一个符号表征系统，可以谈论过去和现在环境之外的事情。

Once language starts to develop from about age 2, they do have a system for symbolic representation and can talk about things which aren't in their immediate environment including the past.

youdao

他们开始发展独自的个性。

They began to grow as individuals.

《柯林斯英汉双解大词典》

But Milton was also beginning to develop in this period a much more strict, a much more disciplined religious temperament.

但弥尔顿这时也开始发展一种更严格，更符合一定规则的宗教性文字。

耶鲁公开课 - 弥尔顿课程节选

All right. So you can already begin to see a development in intellectual history that perhaps opens the way to a certain skepticism.

好，所以大家已经开始看到,人类思想史的一个发展,它很可能为某种怀疑主义开辟了道路。

耶鲁公开课 - 文学理论导论课程节选

It was a very, very important part of maintaining the friendship bounds that started at the beginning of the 12-week course and they will take them going forward.

这是维持友谊关系,至关重要的一步,为期12周的课程开始时,他们建立了友谊,而今后它将进一步发展。

麻省理工公开课 - 媒体、教育、市场课程节选