For me they normally happen, these career crises, often, actually, on a Sunday evening, just as the sun is starting to set, and the gap between my hopes for myself and the reality of my life starts to diverge so painfully that I normally end up weeping into a pillow.

可持续发展不再是选择；它是当今世界生存的必要条件。

如果没有了解植物生长规律的农民，最先进的温室也毫无价值。

"The more you read, the more things you will know. The more that you learn, the more places you'll go."

The great question which, in all ages, has disturbed mankind, and brought on them the greatest part of their mischiefs, has been, not whether there be power in the world, nor whence it came, but who should have it.

城市记得人们遗忘的事。

在了解物理力、它们的规律及相互关系之后，接下来是它们起源的问题。