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这些岛屿是由火山构成的。用英语怎么说？

这些岛屿是由火山构成的。

The islands are volcanic.

相关词汇
the islands are volcanic

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；
例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

islands

n. 岛，岛屿( island的名词复数 )，群岛；
例句
The Aleutian chain is a long arc of islands in the North Pacific.
阿留申群岛是北太平洋上一长串呈弧形排列的小岛。

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；
例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

volcanic

adj. 火山的，猛烈的，暴烈的；n. 火山岩；
例句
...the Azores, a rugged, volcanic archipelago of nine islands.
亚速尔群岛，由9个小岛组成的多岩石的火山群岛
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
The submarine can submerge very quickly.
潜艇能非常迅速地潜入水中。
The ice blocks up the river, making the upstream water unable to flow.
冰把河道堵住了, 上游的水流不下来。
He received many honours from many cities, colleges and societies.
他享有许多城市、大学及学会所授予的荣誉称号。
A yellow blouse goes with her blonde hair.
黄色短上衣和她的金发很相称。
The boy regained the use of his arm.
这男孩恢复了手臂的功能。
Sorry, I can't oblige you.
很抱歉, 我不能帮你的忙。
Unprofitable eloquence is like the cypress,which is great and tall,but bears no fruit.
无益的雄辩犹如柏树,虽然高大但不结果。
I have a vivid memory of her face.
她的容貌栩栩如生地印在我脑海里。
He rose to the occasion and gave an excellent speech.
他随机应变, 发表了一段精彩的演讲。
The furnishings and paintings had been chosen with impeccable taste.
室内的家具和油画都经过精心选择。