1 sentence

1. 你咳嗽、打喷嚏或打哈欠的时候要捂住你的嘴。

   nǐ ké​sou, dǎ pēn​tì huò dǎ hā​qian de shí​hou yào wǔ zhù nǐ de zuǐ.

   Cover your mouth when you cough, sneeze, or yawn.

   Source: Tatoeba