Stray birds of summer come to my window to sing and fly away。 And yellow leaves of autumn， which have no songs， flutter and fall there with a sigh。

Nature has been the greatest chemist of all time, and we are just beginning to understand its secrets.

Nature， to be commanded， must be obeyed.

The boundaries which divide Life from Death are at best shadowy and vague. Who shall say where the one ends, and where the other begins?

如果你不冒险，你将永远为那些敢于冒险的人工作。