And when they leave,they take your life of details with them. You are expected to move on again, but you don't remember what it was that moved you, because no one's asked you in so long. Not even yourself.

在数学中，没有捷径可走。

可持续性不再是选择，而是我们对后代的责任。

The past is a foreign country; they do things differently there.

在任何情况下生存的最佳方法就是为之做好准备。