证人在法庭上当场作证。

Zhèng rén zài fǎtíng shàng dāngchǎng zuòzhèng.

The witness testified in court on the spot.

发现问题，我们应该当场纠正。

Fāxiàn wèntí, wǒmen yīnggāi dāngchǎng jiūzhèng.

When problems are discovered, we should correct them on the spot.

他当场就答应了我的请求。

Tā dāngchǎng jiù dāying le wǒ de qǐngqiú.

He agreed to my request on the spot.