"Don't spit" translated into English

It should be NO SPITING! In Westerners' habits, spitting is very uncivilized and impolite. Therefore, this was said in a prohibitive tone. It's not like the Chinese custom of using "please don't". Therefore, any translation with "please" is incorrect. Also, "anywhere" generally does not need to be translated literally. This sentence was specifically taught by the professor as an example during our translation class. Many of my classmates are influenced by their Chinese habits and have committed the problem of "writing business".