... rare earth elements 稀土元素 rare earth nuclei 稀土核 rare earths 稀土族 ...
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even-even rare-earth nuclei 稀土偶偶核
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These two elements, part of a group called the rare-earth metals, have unusual configurations of electrons orbiting their nuclei, and thus unusually powerful magnetic properties.
在这两种同属稀土金属的元素中，围绕原子核旋转的电子排列方式很不寻常，因此具有异乎寻常的强大磁性能。
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