It is indeed an opinion strangely prevailing amongst men, that houses, mountains, rivers, and in a word all sensible objects, have an existence, natural or real, distinct from their being perceived by the understanding.
虽然无法改变过去,但可以改变未来。
我想揭示大自然的秘密,用来造福人类。我认为,在我们的短暂一生中,最好的贡献莫过于此了。
国际体系本质上是竞争性的,国家不断试图互相超越。