1. So vast is the number of planets, that intelligent life is bound to be a natural part of the universe.
    但是行星的数目是那么庞大，有智力的生命必然是宇宙的自然组成部分。

2. There are three thousand million other Milky Ways, or Galaxies, in the universe.
    在宇宙中有30亿个其他银河系或天河。

3. If then we are so certain that other intelligent life exists in the universe,
    既然我们如此坚信宇宙中存在着其他有智力的生命，