不过，前天和昨天，我却感觉无比轻松！

But how light-hearted I was yesterday and the day before!

youdao

左边是一处名为杜鲁阿里的火山残余隆峰，再往前，则是鲍里半岛和亚迪湖，那儿正是我们前天旅程的起点。

To the left was the low hump of a relict volcano called Dulu Ali and, beyond, the Bouri Peninsula and Yardi Lake, where we’d started the day before.

youdao

人们不能简单地说某事发生过，而是必须加动词后缀，来说明事情到底是刚刚发生的，是今天早些时候发生的，是昨天发生的，还是前天发生的。

One cannot say simply that something happened; the verb ending shows whether it happened just now, earlier today, yesterday or before yesterday.

youdao

If you take a look at the last day, or the day before, you will see that we talked about average valence electron energy.

如果你注意到昨天或者前天的事，你将看到,我们讨论的是平均价电子能。

麻省理工公开课 - 固态化学导论课程节选