Keller's and Addate's species samplings are not, of course, conclusive, and plenty of other surveys since 1978 do tie the extinctions closely to the asteroid.

当然，Keller ' s和addate ' s的物种取样并非决定性的。自1978年开始很多调查就将物种灭绝与小行星联系在一起。

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Iridium is rare on Earth but common in space, and the Alvarezes proposed that a giant asteroid had hit the Earth, producing the sudden decline in species.

铱在地球上很稀有，但是在宇宙空间中却很常见。Alvare z提出一个巨大的行星曾经撞击地球，造成了物种的突然减少。

youdao

An example is the KT Mass Extinction when the last dinosaur and ammonite species, among others, became extinct, perhaps as a result of an asteroid striking the Earth.

比如，白垩纪至第三纪所发生的大灭绝。当时，可能由于一颗小行星撞击地球，恐龙和众多同时代的物种都灭绝了。

youdao

An example is the KT Mass Extinction when the last dinosaur and ammonite species, among others, became extinct, perhaps as a result of an asteroid striking the Earth.

比如，白垩纪至第三纪所发生的大灭绝。当时，可能由于一颗小行星撞击地球，恐龙和众多同时代的物种都灭绝了。

youdao