成语
动子
都可以
100

前所未有

Unprecedented

100

席卷

to engulf / to sweep / to carry away everything

100

反气旋

anticyclone

200

臭名昭著

Notorious

200

衍生

to give rise to / to derive / derivative / derivation 

200

催化剂

Catalyst

300

无能为力

impotent (idiom) / powerless / helpless

300

配给

to ration/ to allocate

300

人满为患

Packed with people/ over crowded/ overpopulation

400

遮天蔽日

lit. hiding the sky and covering the earth (idiom); fig. earth-shattering / omnipresent / of universal importance

400

窒息

to choke/ to stifle / to suffocate

400

囤积

to stock up / to lay in supplies / to hoard (for speculation) / to corner the market in sth