单词：rare-earth metal
rare-earth metal的用法和样例：
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。
- This method could determine many non-REE in enriched-europium mixture rare earth oxide at a time and it was a rapid method.该方法能同时测定富铕混合稀土氧化物中多种非稀土元素的含量，提高了分析速度。
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