any one of a group of chemical elements that have similar properties and tend to occur together in nature We import all of our rare earths from China. 我们从中国进口所有稀土。 The bones were analysed for their rare earth element contents. 分析骨头的稀土元素含量。 Rare earth metals are used in virtually every electronic device. 几乎每个电子设备都使用稀土金属。