When she walked onstage she was given a standing ovation.

当她走上台时，观众起立鼓掌欢迎。

You have to be onstage at eight o'clock.

你务必8点钟上台演出。

Onstage, the musicians are actually sitting behind the loudspeakers.

舞台演出时，乐师实际上坐在扬声器后面演奏。