iridium

释义

n. 铱\n[化] 铱Ir

例句

Analyzing the fossils at this small site, they counted 52 distinct species just below the iridium layer.

他们分析了这个小地区的化石层，一共计算了在铱层下面的52个不同物种。

This story, though, raises the question of why there is but a single ejecta layer of iridium and shocked quartz in late Cretaceous rocks around the world.

不过，这一假设提出了个问题，在全球各地白垩纪晚期岩石中，只有单独的一层铱和冲击石英，这是为什么？