在过去的四十年里，澳大利亚变了很多。

Australia has changed a lot in the past forty years.

youdao

在过去的四十年里。

During the past four decades.

youdao

商业的航空公司在过去的三四十年间已经在飞行速度上慢下来了。

Commercial airlines have slowed down over the last three or four decades.

youdao

商业的航空公司在过去的三四十年间已经在飞行速度上慢下来了。

Commercial airlines have slowed down over the last three or four decades.

youdao