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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。
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。
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。
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 generally accepted usage
被普遍接受的用法
When the doctor arrives, bring him up.
医生来时, 带他到楼上。
a rollicking celebration
欢闹的庆祝会
The police pressed on with the investigation.
警方不顾困难, 继续进行调查。
He had nowhere to go, so I took him in.
他无处可去, 所以我收留了他。
The composer’s works will always live on.
这位作曲家的作品将永远留在人间。
He was killed by a single bullet in the heart.
他被一颗子弹射中心脏而死。
an acting copy
<戏>台本, 脚本
The enemy's forces rallied, and made a fresh attack on the town.
敌军重新调集兵力, 对该城发动了又一次进攻。
She is superstitious about spilling salt on the table.
她迷信把盐倒翻在桌子上的说法。