L SETI is the Search for Extraterrestrial Intelligence - the program that analyzes radio signals from space for signs of intelligent life.

l SETI是一个以搜寻外星空间文明的信息为目的的非盈利机构——他们的计划是通过对来自太空的电磁信号加以分析筛选，从而寻找来自地外智能生命的信息。

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Jill Tarter, a director of the SETI Institute (search for Extraterrestrial Intelligence), has been searching for life on other planets for the last 50 years without any guarantee of success.

吉尔·塔尔特是SETI(外星智能搜寻)研究中心的一名主管，虽不确定成功与否，50年来却一直在搜寻外星生物。

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Perhaps the most famous effort in the hunt for alien life is the Search for Extraterrestrial Intelligence (Seti), once funded in part by US space agency Nasa, which continues to listen to and look around the cosmos for signs of intelligent civilisations elsewhere.

BBC: 'No evidence' for extraterrestrials, says White House