1. But other suns, stars as the astronomers call them, are bound to have planets like our own, and as the number of stars in the universe is so vast, this possibility becomes virtual certainty.
    但是，其他的太阳，既天文学家所说的恒星，肯定会有像我们地球一样的行星。因为宇宙中恒星的数目极其庞大，所以存在着产生生命星球的这种可能性是肯定无疑的。

2. Descartes had unsuccessfully searched for certainty, first in the world of books, and then in the world of men. Then in a dream on November 10, 1619, he made the significant discovery that he could only find certainty in his own thoughts, cogito erg
    在这之前，笛卡儿一直在寻找确定性，先是在书本里，然后是在人群中，但均未成功。之后，在1619年11月10日的一个睡梦中，他有了一个意义重大的发现，即确定性只存在于自己的思想中，"我思，故我在"。

3. Its certainty has been accepted.
    这事的确实性已得到承认。