Russian scientists expect humanity to encounter alien civilizations within the next two decades, a top Russian astronomer predicted on Monday.

俄罗斯一位权威天文学家周一预测，在未来二十年内，人类将能和外星人相遇。

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By his own admission, Burton was an introverted, destructive child – he would try to convince the boy next door that an alien invasion had begun or would tear the heads of his toy soldiers.

但波顿本人也承认，自己是个内向又爱瞎胡闹的孩子—他曾试过向邻居家的男孩证明外星人已开始入侵地球或者把玩具士兵的头给撕烂。

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But within the next few years, astronomers expect to find dozens of alien earths that are roughly the size of our planet.

但是在接下来的几年内，天文学家期待着发现几十个在大小上大致类似于我们这颗行星的星外地球。

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The borg is a character in the television show Star Trek: The Next Generation, an alien life form that is part human and part machine.

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Barack Obama or Mitt Romney will face their share of difficult times, but it is unlikely the next president will be tested by an invading alien force.

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