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1,  crackdown      

n.  a crackdown is an action by authority to stop something or to ban something.

The government has launched a crackdown on no smoking in the public.

2,  belittled     

vt. if you belittle someone or something, you make it seem unimportant or lower in quality.

The boss asked staff for giving suggestions and  belittled all pieces at the same time.

3,  under fire

if someone or something is under fire, they are being criticized very strongly.

The CEO is under fire for failing to lead the team.

4,  head teacher 班主任

The head teacher always deal with the problems between the students.