The search for extraterrestrial intelligence, or SETI, is a 50-year-old idea.
用这个方法搜索地外文明（英文为SETI），已是一个有50年历史的构想了。
In the deepest sense, the search for extraterrestrial intelligence is a search for ourselves.
从最深层次的意义来说，探寻外星人就是寻找我们自己。
The standard approach to answering that question focuses on the search for extraterrestrial intelligence.
回答这种问题的标准方法着重于寻找外星文明。
The standard approach to answering that question focuses on the search for extraterrestrial intelligence.
回答这种问题的标准方法着重于寻找外星文明。
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