dos
noun [ plural ] uk/duːz/ us/duːz/
dos and don'ts (also do's and don'ts)规定，规则;规矩
rules about actions and activities that people should or should not perform or take part in
The teacher spent ten minutes explaining all the dos and don'ts in the classroom. 老师花了十分钟解释课堂纪律。
Before you start using the system, here are a few do's and don'ts.
She sent me an article called "The Do's and Don'ts for Resume Writing."
There were a lot more dos and don'ts when I was younger.
The visitors were briefed about the production facility and about the do's and don'ts once inside the facility.