数学的本质在于它的自由。
我们必须将地球视为一个单一的有机体，并尊重它。
当今能源领域的领导力既需要技术专长，也需要道德勇气。
The true artist will let his wife starve, his children go barefoot, his mother drudge for his living at seventy, sooner than work at anything but his art.
