英文 一句英文

他唱的太好 , 以為他是 " playback "

He's a pretty good singer, he sang like original sound track.

I quess what you mean "playback" meant "original sound track".

推薦您一個非常不錯的英語學習網站，里面有很多非常不錯的學習資源：

http://www.hkenglishstudy.info

希望可以幫到你

What does "playback" mean? It is a little bit vague.

You should say:
He sang too well as if it was / is not his voice.

Hope that you find it useful.