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。
Rare earth metals are often all found together, typically with far more light than heavy elements.
稀土元素通常是同时被发现的，一般来说轻稀土元素的数目远甚于重稀土元素。
Rare earth metals are often all found together, typically with far more light than heavy elements.
稀土元素通常是同时被发现的，一般来说轻稀土元素的数目远甚于重稀土元素。
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