他发明的用来估计找到外星人机率的著名“德雷克方程”指出，在我们的银河系，可能存在一万个可探测的文明。
The famous "Drake Equation" which he invented to estimate the chances of finding et indicated there might be 10, 000 detectable civilisations in our galaxy, the Milky Way.
l德雷克方程是天文学家法兰克·德雷克提出的一个计算方法，用来测算银河系中可能存在的文明社会的数量——计算的结果，竟是数以百万计！
L the Drake Equation was proposed by astronomer Frank Drake to work out how mane civilizations there could be in our galaxy - and the figure is millions!
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