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The main useful mineral is celestine.是什么意思？

The main useful mineral is celestine.

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.

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；
例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

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；
例句
The school occupies split-site accommodation on the main campus...
该学院分散在主校区不同地点。

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。

mineral

n. 矿物，矿石，矿物质，汽水；adj. 矿物的，似矿物的；
例句
...an effervescent mineral water.
含汽矿泉水

is

vt.& vi. 是（be的三单形式；n. 存在；
例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

celestine

天青石；
例句
This paper shows the test results of certain celestine ore.
论述了某天青石矿浮选试验研究结果.
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一份耕耘，一份收获。
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该法令迫使工会推迟罢工。
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我们班大部分同学选修日语.
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I have a good pair of skates, but no matter how tightly I lace them, my ankles wobble.
我有一双不错的溜冰鞋，可是不管我把鞋带系得多紧，脚脖子那里还是空落落的。
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把桂皮和剩下的糖混合在一起。
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他的名字突然出现在这一季所有选举会议上。
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