你擦一擦嘴吧。

Nǐ cā yì cā zuǐ ba.

Wipe your mouth.

他亲了我的嘴。

Tā qīn le wǒ de zuǐ.

He kissed my mouth.

吃饭的时候不要说话，嘴里有饭呢。

Chīfàn de shíhou búyào shuōhuà, zuǐli yǒu fàn ne.

Don’t talk while eating; your mouth is full of food.