Please use a tissue to blow your nose, not your hand.

请用纸巾擤鼻涕，不要用手。

Mind your Sunday clothes, and remember to blow your nose.

小心你的礼拜服, 记得擤鼻子.

Don't blow your nose or use the toothpick at table.

不要拧鼻涕或用牙签剔牙。

It is bad manners to blow your nose at the table.

吃饭时擤鼻涕是不礼貌的.

Never again will you endure the ignominy of being out in public with no way to blow your nose.

你们再也不用忍受外出在公共场合没办法擤鼻涕的耻辱了。

Some cultures find it disgusting to blow your nose in public -- especially at the table. The Japanese and Chinese are also repelled by the idea of a handkerchief.

有些文化认为当众擤鼻涕是让人厌恶的行为——尤其在餐桌上。日本人和中国人还排斥使用手帕。