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。

youdao

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。

youdao

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.

MSN: Big sunspot unleashes an intense solar flare

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