可持续发展不仅仅是一个流行词，而是我们对后代的责任。

You may have to fight a battle more than once to win it.

We try to buy stocks selling at a discount from their asset value.

The photograph is literally an emanation of the referent. From a real body, which was there, proceed radiations which ultimately touch me, who am here.

发散级数是魔鬼的发明，基于它们的任何证明都是一种耻辱。