粒子的概念只是近似的，并且只有在动量较小的极限下才有意义。

Every painting tells a story, but not everyone can read it.

We are all alone, born alone, die alone, and—in spite of True Romance magazines—we shall all someday look back on our lives and see that, in spite of our company, we were alone the whole way.

水产养殖的创新不仅仅是技术问题，更是理解自然的节奏并与之合作。