The EuropeanSpace Agency is working on a mission called Don Quijote that aims to use alarge, heavy spacecraft to ram an asteroid out of the way.
欧洲航天局正致力于一项堂吉诃德研究项目，该项目旨在使用大型、重型航天器撞击小行星使其偏离原轨道。
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Because it is difficult to trace hackers, exactly who isbehind any specific attack and how and where they operate remains to alarge extent a mystery, technology experts say.