It's 1927. Things are changing.

927年，事情发生了变化。

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and you feel like something has to change,

你感觉有些事情会发生变化，

I'm worried 课堂 - SpeakingMax英语口语达人

Again, it shows how much things have changed during that period of time.

这显示了那期间,事情发生了多大变化

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Things started to change probably on the first day of class, but not entirely-- because there's shopping period and it's such a wonderful thing-- you shop for classes.

事情也许从开课第一天就发生变化，但没有完全不同-,因为这是购物期，妙不可言的阶段-,你们选择课程。

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And then suddenly things begin to change.

事情突然开始发生变化。

哈佛公开课 - 幸福课课程节选