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。
This sediment layer is enriched in the rare metal iridium and other elements that are relatively abundant in a meteorite but very rare in the crust of Earth.
在商界位居高职的妇女仍然十分罕见。
Women are still something of a rarity in senior positions in business.
婴幼儿患肾结石是十分罕见的。
应用推荐