3 sentences

1. 他在台上演讲，一点也不紧张。

   tā zài tái​shàng yǎn​jiǎng, yī​diǎn yě bù jǐn​zhāng.

   He wasn't nervous at all while giving his speech on stage.

   Source: Dong Chinese Dictionary

2. 是台上这两位！

   shì tái​shàng zhèi liǎng wèi!

   It's these two on stage!

   Source: OpenSubtitles

3. 演员正在仔细检查台上的砌末。

   yǎn​yuán zhèng​zài zǐ​xì jiǎn​chá tái​shàng de qì​mò.

   The actors are carefully checking the stage props.

   Source: Dong Chinese Dictionary