在正式的场合请注意言行。

Zài zhèngshì de chǎnghé qǐng zhùyì yánxíng.

Pay attention to your words and actions in formal situations.

在家庭聚会的场合，她很活跃。

Zài jiātíng jùhuì de chǎnghé, tā hěn huóyuè.

She is very active at family gatherings.

这是一个庄重的场合。

Zhè shì yīgè zhuāngzhòng de chǎnghé.

This is a solemn occasion.