What if we encounter an alien civilization whose intentions are completely baffling?

问题是，如果完全无法判明我们所遭遇的外星文明的来访意图，该怎么办？

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The archeologist said that the pyramids are the remnants of an alien civilization .

里边的考古学家说这些金字塔是一种地域外文明的遗迹。

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Surely if an alien civilization is advanced enough to master space travel, it can devise more effective ways of communicating with us.

自然地，如果有外星人文明已先进到可以掌控太空旅行，它可以通过更有效的途径与我们交流。

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Or maybe,instead of a radio signal, an alien civilization sent us something physical.

VOA: standard.2010.04.16

Fifty years ago this week, a young Cornell University scientist named Frank Drake pointed a radio telescope at a distant star, hoping to hear transmissions from an alien civilization.

VOA: standard.2010.04.16

Besides, it doesn't make sense to tease an alien civilization with just a "hello, " considering that it could take millennia before we hear back from them.

FORBES: How To Talk To Aliens

If we ever make contact with an alien civilization and we want to explain to them who we are, the best thing we can do is get them a Facebook account.

FORBES: The Future Of Facebook: What's After The Social Graph?

Mutants, evil alien races and robots terrorize what's left of civilization and those who have the wealth and power have fled to Antarctica -- the last refuge for those who want to live comfortably.

CNN: 'Defiance' merges TV, video-gaming worlds