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这是一项极其有用的发明。用英语怎么说？

这是一项极其有用的发明。

It's a most useful invention.

相关词汇
most useful invention

most

adv. 最，最多（大），much的最高级，非常，很，几乎；adj. many的最高级，最多的，最大的，大概的，大多数的，大部分的；n. 最大限度，大部分，大多数人；
例句
As long as most people are happy to have the monarchy, the abolitionist position is an arrogant fantasy.
只要大多数人还乐意保留君主制，废除它的主张就是痴人说梦。

useful

adj. 有用的，有益的，有帮助的，令人满意的；
例句
A tripod will be useful to align and steady the camera...
三脚架有助于调准和稳定相机。

invention

n. 发明，发明物，捏造：内心捏造的东西，特指谎言，发明才能；
例句
...the invention of the printing press in the fifteenth century.
15 世纪印刷机的发明
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
相关例句
Dividing 3 into 6 gives 2.
六除以三等于二。
They will continue Mr. Kabe as acting principal of the school.
他们将继续让凯布先生做该校代理校长。
The sanitary conditions in this restaurant are abominable.
这家饭馆的卫生状况糟透了。
Their envoy showed no sign of responding to our proposals.
他们的代表对我方的提议毫无回应的迹象。
His grip weakened as he was tired.
因为累了, 他紧握的手放松了。
Many people like to watch others playing games.
许多人喜欢看别人比赛。
The house fits into the scenery so well that you can hardly see it.
这座房子与周围景色十分协调一致，你几乎看不见房子。
They have contracted to build a railway across Africa.
他们已立约承建一条穿越非洲的铁路。
The hotel sleeps 400 guests.
这旅馆可供四百人住宿。
There is no other team with the privilege to have such a deep symbiosis with a football genius.
从没有任何一个球队与一个足球天才保持着如此深的特殊依附关系。