a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium
例句
a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite. 稀土属金属元素，用于激光中，见于磷灰石、独居石、磷钇矿和硅铍钇矿中。
a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite 稀土属金属元素，用于激光中，见于磷灰石、独居石、磷钇矿和硅铍钇矿中
a metallic element of the rare earth group;used in lasers;occurs in apatite and monazite and xenotime and ytterbite. 稀土属金属元素，用于激光中，见于磷灰石、独居石、磷钇矿和硅铍钇矿中。
1.a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite. 稀土属金属元素，用于激光中，见于磷灰石、独居石、磷钇矿和硅铍钇矿中。
10. a metallic element of the rare earth group;used in lasers;occurs in apatite and monazite and xenotime and ytterbite. 稀土属金属元素，用于激光中，见于磷灰石、独居石、磷钇矿和硅铍钇矿中。
