人们永远不会注意到已经做了什么；人们只能看到还有待完成的事情。
One never notices what has been done; one can only see what remains to be done.
The historian must be impartial, but not indifferent.
自适应控制是关于实时调整控制器参数以应对系统动态变化的方法。
他一直太忙以至于无法生活，现在他太忙以至于无法死去。
The best stories are those that remind us that the world is alive.