“我们想找到另一种方法以确定人类何时开始穿衣服。”里德说。

"We wanted to find another method for pinpointing when humans might have first started wearing clothing, " Reed said.

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但是，随之而来的是何时开始计数的问题，因此，在14世纪早期，一些系统发生了变化。

With these, however, arose the question of when to begin counting, and so, in the early 14th century, a number of systems evolved.

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当我们考虑这些蝙蝠的夜间生活方式时，我们会发现，它们必须对不断变化的光线水平保持敏感，因为这是它们感知何时开始狩猎的方式。

When we consider the nightly lifestyle of these bats, we will see they have to be sensitive to the changing light levels because this is how they sense when to start hunting.

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If we want to worry about when,if ever, is an abortion justified,it might be worth getting clear on, when do creatures like us start?

如果我们想要弄清楚，堕胎在什么时候是可以接受的，就要弄清楚，我们这样的生命是何时开始的？

耶鲁公开课 - 死亡课程节选

It's a little puzzle piece that says when the green flag is clicked and this is kind ; of like the beginning of a program; when you double click an icon on your desktop this is how something like that is implemented; it's listening for that double click, it's listening for that green flag.

是一小个按钮，它的意思是,何时点击绿色旗帜,这就好比开始运行程序;,当你双击桌面上的图标,就开始执行操作,桌面的图标需要双击，绿色小旗也等待点击来执行命令。

哈佛公开课 - 计算机科学课程节选

How did they determine when two armies would charge each other?

他们如何确定双方何时开始进攻

耶鲁公开课 - 古希腊历史简介课程节选