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。
They had found, accidentally, that a rare metal, iridium, suddenly became very abundant exactly at the boundary and then slowly fell away.
尤卡坦半岛上富含铱的沉积层和一个巨大的陨石坑提供了证据，证明了约6500万年前，一颗大型陨石撞击了地球。
An iridium-enriched sediment layer and a large impact crater in the Yucatn provide evidence that a large meteorite struck Earth about 65 million years ago.
在电脑内存设备护面，深水导管，X射线望远镜和制造粘胶纤维的设备中，也都能找到铱的身影。
Iridium can also be found in crystals in computer memory devices, deep-water pipes, X-ray telescopes and the equipment that makes rayon fibers.
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