正式

你没必要那么正式。

Nǐ méi bì yào nà me zhèng shì.

You don't have to be so formal.

正式工比临时工要好。

Zhèng shì gōng bǐ lín shí gōng yào hǎo.

A permanent job is better than a temporary one.

您没必要准备一个正式的演讲。

Nín méi bì yào zhǔn bèi yī ge zhèng shì de yǎn jiǎng.

You don't need to prepare a formal speech.