guideline       
noun [ C usually plural ] uk/ˈɡaɪd.laɪn/ us/ˈɡaɪd.laɪn/
C1 指导方针,指导原则,准则
information intended to advise people on how something should be done or what something should be
  The EU has issued guidelines on appropriate levels of pay for part-time manual workers. 欧盟已经颁布了有关兼职体力劳动者适宜的酬劳标准。 
 - More examples
 - Playground guidelines come under the Department of Health and Safety.
 - It is intended that these guidelines should be applied flexibly and pragmatically.
 - Most teachers think the government's guidelines on homework are too prescriptive.
 - We follow very strict guidelines on the use and storage of personal details on computers.
 - Manufacturers may fall foul of the new government guidelines.