please do not

to kill on sight (without fear of prosecution)

don't say you haven't been forewarned (a serious diplomatic warning or ultimatum used by the PRC)

to set an issue aside for the moment

(of one's political views) to prefer left rather than right (idiom during the Cultural Revolution)

Do not do to others what you would not have them do to you; the principle of reciprocity from the Confucian Analects.

don't forget your friends when you become rich

A formal request or command prohibiting people from smoking in a specific area, often used on signs.

please do not disturb

must not; by no means

serious inquiries only

(Internet slang) don't call on me; don't drag me in

Never forget national humiliation, refers specifically to the 1931 Mukden Incident and subsequent Japanese annexation of Manchuria.

the forget-me-not flower, a plant of the genus Myosotis

(Internet slang) it's nothing, there's no need to compliment; just a routine move