We have already determined that there are no threatening asteroids as large as the one that killed the dinosaurs.

我们已经决定，没有威胁的小行星一样大的恐龙的死亡。

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America's space agency, NASA, is soon expected to launch a new, much more detailed survey of potentially threatening asteroids.

作为美国太空机构的美国宇航局(NASA)很快被寄希望于发动一场全新的、关于存在潜在威胁的小行星的超详细测查。

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"We have already determined that there are no threatening asteroids as large as the one that killed the dinosaurs, " the space agency said.

那太空机构说：“我们已经有坚定的心，那理并没有大到会杀哂恐龙的行星威胁”。

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Science editor Alan Boyle's blog: NASA's top expert on near-Earth objects says that new telescope systems are gradually getting a handle on potentially threatening asteroids.

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However, many more of these threatening asteroids will surely be found in coming years (indeed, within the past two months, a newly discovered object 1km across caused a brief flurry, until its orbit was properly calculated).

ECONOMIST: The American Association for the Advancement of Science