... light rare earth element 轻稀土元素 light rare earth elements 轻稀土元素 magnesium rare earth 稀士镁合金 ...
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There are two kinds of rare earth metals, the heavy rare earth elements and the light rare earth elements.
稀土有两种，一种是重稀土，一种是轻稀土。
Addition of strengthening elements can further improve heat-resisting strength; while light rare-earth elements can reduce the production cost instead of Y.
加入强化元素能进一步提高合金的热强性。用轻稀土元素代替Y则能降低生产成本。
So the LEDs found in current household applications are blue diodes daubed with a powdered coating called a phosphor, which includes rare-earth elements that filter blue light.
所以，现在家用的LED是将蓝色的发光二极管的外壁涂上粉末状的磷，其中含有的稀土元素可以把蓝光过滤掉。
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