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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 king rules in that country.
那个国家一切听从国王裁决。
His advantage turned against him.
他的优势后来成了他的不利条件。
They painted him to be indecisive, negative, and selfish.
他被描绘成一个优柔寡断、消极又自私的人。
The staff staged a one-day walkout .
职员突然罢工一天。
There was a total eclipse showing up in the sky on July 22, 2009 in China.
2009年7月22日，中国的天空上呈现了一场日全食。
The quantum leap in writing technology came with the introduction of personal computers.
个人电脑的使用带来了书写技术的飞跃发展。
This is an authentic news report.We can depend on it.
这是篇可靠的新闻报道, 我们相信它。
Help me shove this furniture aside.
帮我把这家具推到一边去。
They dug into the pizza hungrily.
他们开始大吃比萨饼。
We are very anxious to keep up the reputation of the firm.
我们对于保持公司的名誉非常急切。