Without something of this kind, searching for intelligence on other planets would be like trying to meet a friend in London without a pre - arranged rendezvous and absurdly wandering the streets in the hope of a chance encounter.

• 没有这种手段，想寻觅其它行星上的智力生命，将如同在没有事先约定地点的情况下，而且想以荒唐地逛大街的办法以期偶然碰巧在伦敦遇见一位友人一样。