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汉语拼音：xī yǒu yuán sù

1.自然界中存在的数量少或很分散的元素。如锂﹑铍﹑钽﹑镓﹑硒﹑碲﹑氪﹑氩﹑氡等。

1. 自然界中存在的数量少或很分散的元素。如锂、铍、钽、镓、硒、碲、氪、氩、氡等。

• a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements.

  一种火成岩，由富含稀有元素的岩浆结晶而成的极粗的花岗岩构成。

• A coarse- grained granite, sometimes rich in rare elements such as uranium , tungsten, and tantalum .

  花岗伟晶岩一种有时富含铀、钨和钽等稀有元素的粗纹理花岗岩。

• Uranium is very valuable because it is a rare element.

  铀很贵重，因为它是稀有元素。

• A rare element was found last year.

  去年发现了一种稀有元素。

• besides, extraction technologies for rare elements should be developed based on the technological innovation;

  此外积极进行技术革新，开发稀有元素提取技术；