我们无从知晓银河系中是否还有其他的智慧生命，抑或我们人类是银河的唯一孩子（目前，事实是这样的）。
We could be the only life-forms in our entire galaxy (so far, there is little evidence otherwise).
也许，地球所在之处是银河系的犄角旮旯，如果真是这样，我们在短期内不太可能与其他外星智慧生命有接触。
The Earth may exist in an underpopulated portion of the Milky Way, meaning we might not encounter another alien intelligence for a long, long time, if at all.
1961年Frank Drake提出了其用于估计银河系中有能力与我们通信的智慧文明数目的著名方程序。
In 1961 Frank Drake proposed his famous equation for estimating the number of intelligent civilisations capable of communicating with us in our own galaxy.
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