表示在那一天。

C on that day.

youdao

在那一天，许多孩子出来到户外.on用来表示在具体的某一天。

(B. On) that day, lots of children go out in the open air.

youdao

在那一天，许多孩子出来到户外.on用来表示在具体的某一天。

(B. On) that day, lots of children go out in the open air.

youdao