rare-element

常见例句

• The color of Apatite is often due to the presence of rare earth elements.
  磷灰石的颜色常取决于存在的稀土元素。
• The extent of beneficial effect of each element considerably depended on its affinity for oxygen.
  各合金优良的抗氧化性与稀土元素对氧的亲和力密切相关。
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