The plane left two hours ago.

飞机两小时前起飞。

youdao

He left two hours ago.

他两个小时以前离开的。

youdao

He left two hours ago. He must have arrived home.

他两个小时前就走了。他一定到家了。

youdao

Let's create a graph here that on the x axis it's going to be time, so time zero will be when you first take in a food and then one hour later, two hours later will be shown as you go from left to right, and then we'll have blood glucose level up on the y axis.

我们在这建立一个曲线图,X轴代表的是时间,所以零时间点是你第一次进食的时间,然后一小时以后,两小时以后,是从左到右呈现在图表上的,在Y轴上是你的血糖值

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

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