2) It is necessary for sB. to do sth. (It is necessary that ...) ...

是必须的;必须...
3) It is necessary for sb. to do sth. (It is necessary that

是必须的; 必须...
4) learning of teacher

教师的学习
5) Must have a good sense of taste,

必须有好的味觉,
6) Is the medical examination obligatory ?

体检是必须的吗?
补充资料:是必
1.务必;必须。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条