正在他们谈话的时候，上课铃响了。

While they were talking, the bell rang.

youdao

上课铃响了，孩子们还和课前一样吵闹，因为有些老师还没有到教室。

The pre-class clamour of children does not stop with the bell because some teachers have not turned up yet.

youdao

上课铃响了，令我们意外的是，李老师走进了教师来给我们上课了。

As the bell rang, what surprised us was that Ms Li walked into the classroom to give the class as usual.

youdao

上课铃响了，他端着书本、点名册和粉笔盆来到教室，走上讲台，忽然看见了讲桌上的那碗粥。

The bell was ringing. He came into the classroom with his books, the attendance book and a box of chalk. Going to the platform, he saw the bowlful of gruel on his desk.

youdao

铃响了，开始上课。

The bell rings and the class begins.

youdao

铃响了，开始上课。

The bell rings and the class begins.

youdao