士兵们齐声回答：“遵命！”

The soldiers replied in unison, obey your command!

我希望你们齐声回答。

I want a chorus in the answer here.

我提问题时，他们迅速齐声回答。

When I asked questions, they answered up in chorus.

所有学生齐声回答老师的问题。

Eg: All the students replied in chorus to the teacher's question.

孩子们齐声回答：“不能！”

No！″the children all answered.