Hafnium, Tantalum, Tungsten then we're on to Rhenium, Osmium, and Iridium.

铪、钽、钨、然后就是铼、锇和铱。

Platinum, iridium and the rest are expensive precisely because they are rare.

正因为稀有，铂、铱等矿物才价格不菲。

If I run the hydrazine over an iridium catalyst, it'll separate into N2 and H2.

假如我用铱催化剂分解联氨，它将分解成氮气和氢气。

Along with the high levels of Iridium, they found something even more fascinating - shocked-quartz.

除了高度富集的铱以外，他们还发现了更为奇妙的东西——冲击石英。

One particular little layer though, however, showed a whopping increase in the concentration of the metal Iridium.

但其中有一小层却表现出金属铱的高度富集。

Iridium...What do they need the iridium for? -It's a stabilising agent.

铱...他们要铱干什么？-用来做稳定剂。

I'm going to delete " cretaceous, " I'm going to delete " Cenozoic" and I'm going to delete " iridium."

我要删除“白垩纪”、“新生代”、“铱”。

The metre was the distance between two scratches on a bar composed of a special alloy of platinum and iridium.

1米是指一根铂铱特殊合金杆两端划痕间的距离。

Iridium is an element that’s rare on Earth, but very common in asteroids and comets.

铱是地球上稀有的元素， 但在小行星和彗星中却很常见。

Yeah, iridium. It's found in meteorites. It forms anti-protons.

是的，金属铱。这种东西是从陨石中发现的。可以形成反质子。

The earth has Iridium in it, but because it is a heavy metal, most of it settles towards the center of the planet.

地球也有铱，但因为它是重金属，多数都沉降到行星的中心。

And only then, at the very top came the Iridium layer, which coincided with the extinction of the dinosaurs.

最后才轮到见证恐龙灭绝的顶部铱元素层。

It's about 65 million years old and contains a lot of iridium, an element that's usually rare on Earth's surface.

它大约有 6500 万年的历史，含有大量的铱，这种元素在地球表面通常很稀有。

There must have been a long time, between the impact below the core and the arrival of the Iridium at the top.

所以岩芯下的碰撞坑和顶部的铱元素层必然间隔了很长一段时间。

Iraq reported the theft of up to 10 grams of iridium isotope used to treat cancer to the International Atomic Energy Agency late last year.

伊拉克报道称去年年底报道称国际原子能机构用来治疗癌症的铱同位素丢失了10克。

A hunk of platinum and iridium known as the International Prototype Kilogram or IPK. The IPK isn't just how much a kilogram weighs.

一大块铂和铱，称为国际原型千克或 IPK。 IPK 不仅仅是一公斤的重量。

The reason why an asteroid was looked at as the cause of the Iridium spike at the K-T boundary, is because asteroids have an enormous amount of Iridium in them.

一颗小行星被看做是引起KT界限层铱猛增的原因，是因为小行星中有相当多的铱。

But this thick layer of Iridium that separates the Cretaceous and Tertiary periods clearly was an anomaly and it had been deposited over a very short time.

但这个隔开了白垩纪和第三纪的厚铱层显然是个异常事物，而且它在很多的时间内便沉积下来。

And they calculated if you were to spread the amount of Iridium in this layer that adds up to a total amount of material about equivalent to a ten-kilometer diameter asteroid.

他们计算过，要是把这一层里的铱的数量分散开来，那其材料总量就相当于一颗直径10千米的小行星。

Indeed, the discovery of a layer of iridium-rich rock (iridium being one of platinum's relatives) was the first sign geologists found of the asteroid impact that is believed to have killed the dinosaurs.

实际上，地质学家们提出小行星曾撞击地球的第一个证据就是发现了富含铱的岩层（铱是铂的同族元素之一）。人们认为恐龙就是因小行星撞击地球而灭绝的。