真理，通过理性思考和观察自然得出。

A ship is always referred to as "she" because it costs so much to keep one in paint and powder.

发出履行性陈述并不是在做陈述，因此履行性陈述的发言既不真实也不虚假。

We must remember that this is a very small star and probably some of the larger and the more important stars and may be very virtual and happy.

Every technological breakthrough is a challenge to the limits.

You are the author of your own life.