Urge sb /doing 敦促某人干...
Be urgent with sb for sth硬向某人要某物---
It is urgent that句型中需要使用should的虚拟语气
Urgency singals紧急信号
14. It is no use/good + doing...---It is no use pretending you did not know . 你装糊涂是无济于事的.
15. used to do sth---过去长长干某事;be used to doing sth习惯于干某事;be used to do sth被用来干某事
the utilization of debris废品利用
16. Valued被认为有价值的;valuable有价值的,贵重的
Invalid除了做形容词,还可以做名词病弱者,残疾者
An invalid confined to bed卧病于床者
Avail既是名词也是形容词availof利用;of no avail不起作用,没有用
He did not omit to avail himself of the opportunity, cautiously and briefly. 他没有错过这个机会,谨慎而且迅速.
Speeches and protests were of no avail. 演讲和抗议全都徒劳.
Prevail是一个不及物动词,意思是流行,盛行;获胜,占优势
The east wind prevails over the west wind.东风压倒西风.
The east wind prevails in spring.春天盛行东风.
Prevalent才是形容词---流行的,普遍的
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