This sediment layer is enriched in the raremetal iridium and other elements that are relatively abundant in a meteorite but very rare in the crust of Earth.
这一沉积层富含稀有金属铱,以及其他在陨石中较丰富而在地壳中十分罕见的元素。
2
The catalytic activities of other rareearthmetal salts with different ligands were tested.
考察了带有不同配体的稀土金属催化剂对反应的影响。
3
Yet another rareearthmetal, lanthanum, is a major ingredient for hybrid car batteries.