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1·They had found, accidentally, that a rare metal, iridium, suddenly became very abundant exactly at the boundary and then slowly fell away.

他们偶然发现一种稀有金属铱的含量在边界处突然变得很丰富，然后又慢慢地消失了。

2·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.

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。

3·Rare Metal Materials and Engineering.

稀有金属材料与工程。

4·They found a rare metal near the mill.

他们在磨房附近发现了一种稀有金属。

5·This is a rare metal.

这是一种稀有金属。

6·They have abstracted a rare metal from the ore.

他们已从矿砂中提炼了一种稀有金属。

7·Unexploited rare metal ores have a good perspective.

稀有矿现虽未开发，但前景却美好！

8·Metal indium is an important rare metal new material.

金属铟是重要的稀有金属新材料。

9·Toxic and rare metal, adhere to the double lock system.

剧毒和稀有金属，坚持双人锁制度。

10·The new way of hypoxia rare metal produced industrialization was proposed.

为工业规模化生产低氧高纯稀土金属提供了新的途径。