Let's give 'em a big hand.

让我们为他们热烈鼓掌。

Ladies and gentlemen, let's give a big hand to our special guests tonight...

女士们、先生们，让我们以热烈的掌声欢迎今晚的特邀嘉宾…

Please give him(her)a big hand.

请给他她一些掌声。

They gave the singer a big hand.

他们向那位歌手报以热烈的掌声。

Please give him a big hand.

请给他一些掌声。