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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
a swan preening its feathers
一只正在用喙整理羽毛的天鹅
I couldn't bear the upset.
我不能忍受这种扰乱。
The elderly man is quite energetic.
这位上了年纪的老人仍精力充沛。
We sell a wide range of cosmetics at a very reasonable price.
我们以公道的价格出售各种化妆品。
The lifeboat brought off most of the shipwrecked sailors.
救生艇载走了遇难船上的大部分水手。
She had stopped crying but his shouting set her off again.
她已经不哭了, 但是他的大声喊叫使她又哭了起来。
They decided not to modernise the Victorian decor.
他们决定不对维多利亚时代的装潢进行现代派的改变。
The soldiers violated the church by using it as a stable.
士兵们把教堂当马厩, 亵渎了教堂。
The disappearance of a schoolgirl was very worrying among the teachers.
一个小学女生失踪了,教师们非常担忧。
A cat is similar to a tiger in many respects.
猫和虎在很多方面相似。