几十年中，在文明世界的不同国家里都爆发过白喉。

For many decades it has raged among the different nations of the civilized world.

youdao

在最近的这几十年中，我们建了很多的高楼。

We have build many big buildings in the last ten years.

youdao

在最近的这几十年中，我们建了很多的高楼。

We have build many big buildings in the last ten years.

youdao