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矿石组构虽然复杂,但其矿物组成比较简单,有用矿物主要为天青石.用英语怎么说？

矿石组构虽然复杂,但其矿物组成比较简单,有用矿物主要为天青石.

The main useful mineral is celestine.

相关词汇
the main useful mineral is celestine

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；

main

adj. 主要的，最重要的，全力的；n. 最主要的部分，重点，主要管道，体力，[航海]公海；

useful

adj. 有用的，有益的，有帮助的，令人满意的；

mineral

n. 矿物，矿石，矿物质，汽水；adj. 矿物的，似矿物的；

is

vt.& vi. 是（be的三单形式；n. 存在；

celestine

天青石；
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你只管先往前走。我随后就来。
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撒切尔女男爵的主张在很多人看来是可信的。
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一份耕耘，一份收获。
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Diacriticals: Marks above and below letters, such as accents or th cedilla.
发间符号: 在字母上面或下面的符号, 如音标或变音符号.
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奥斯卡讲话很严肃, 声音好象从大岩洞里传出来似的.