Not only did mammals sweep across the planet after K-T, but sharks expanded across the seas, explained American Museum of Natural History vertebrate paleontologist Jack Conrad.
美国自然历史博物馆脊椎古生物学家Jack Conrad解释说，k - T大灭绝之后，不但哺乳动物开始主宰地球，鲨鱼也开始在海洋中扩张。
But while T-bills are as safe from default as anything on the planet, they yield a very low rate of return.
但是虽然从违约来看 T-bill 和这颗星球上的其它事物一样安全，它的回报率却是极低的。
Professor Brian Cox dismisses claims that the LHC could conjure up a black hole that could suck in the entire planet: "Anyone who thinks the LHC will destroy the world is a t***"
图7：布赖恩·考克斯教授对大型强子对撞机会制造出一个可以吞掉整个地球的黑洞的说法嗤之以鼻：“这种想法太荒谬了。”
Imagine a star up t twenty times larger, brighter, brighter and hotter than our own sun. A planet would have to be a very long way from it to be capable of supporting life.
设想一下，一颗恒星比我们的太阳还要大，还要亮，还要热20倍，那么一颗行星为了维持生命就要离开的它的恒星非常远。
Sales of "Pluto is a Planet" T-shirts are high.
印有“冥王星是一颗行星”字样的T恤衫正在热卖。
If we don 't know our planet, our future may be in danger.
要是我们不知道我们的星球，我们的未来就会有危险。
If we don 't know our planet, our future may be in danger.
要是我们不知道我们的星球，我们的未来就会有危险。
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