There have already been a lot of "firsts" to celebrate at the 2016 Summer Olympics.

2016年夏季奥运会上有了很多“第一”可以庆祝。

youdao

There have already been a lot of "firsts" to celebrate at the 2016 Summer Olympics.

2016年夏季奥运会上有了很多“第一”可以庆祝。

youdao