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adj. 稀罕的，稀薄的，罕见的，珍贵的
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- The arguments are so bitter because Gerta Keller has re-opened the case which most others considered closed.
- 辩论相当激烈，因为Gerta Keller又重新提起了大多数人认为已经盖棺定论的事件。
- In doing so she has sparked a scientific civil war.
- 由此，她的行为引发了一场科学论战。
- And all because she questioned the accepted theory about what wiped out the dinosaurs.
- 而这一切都源于她对早已公认的恐龙灭绝原因提出了质疑。
- Scientists began to investigate a layer of rock formed sixty five million years ago.
- 科学家们开始调查6500万年前形成的岩石层。
- It's seen in mines and rock outcrops around the world.
- 它们遍布世界各地裸露地表的矿藏和岩石中。
- Below this layer there are lots of dinosaur fossils, above it there are none. It's called the KT boundary.
- 这个地层下面埋藏着许多恐龙化石，而它的上面却没有。这个地层被称作第三纪界线层。
- This is the KT boundary, and because it's such a thin, sharp line
- 这就是第三纪界线层，由于它是一条窄而清晰的地层，
- we know something dramatic must have happened here, some catastrophe
- 我们断定当时发生过一些剧烈事件，某种大灾难，
- and until recently we have almost no clue what happened whatsoever here, so it remained a total mystery.
- 但直到最近我们都还没有发现有关真相的线索，所以它仍然还是个谜。
- Then in 1979 they discovered a clue in the KT boundary.
- 后来在1979年，他们在第三纪界线层中发现了相关线索。
- A high concentration of an element called Iridium.
- 极高浓度的铱元素。
- Such quantities are extremely rare on earth and usually come from outer space.
- 这种元素在地球上极其稀少，一般都来自外太空。
- So as soon as you find ten thousand times more Iridium at the very moment when the dinosaurs disappear,
- 我们发现铱元素浓度比平常高1000倍，而正是在这个时候恐龙消失了，
- you know somewhere on earth a very big impact must have happened by an asteroid or a comet.
- 所以推测地球上某个地方一定发生了由小行星或彗星造成的大碰撞。
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