Some of you may enjoy doing crossword puzzles, and perhaps doing crossword puzzles a couple hours a day is enjoyable.

有人可能爱玩填字游戏，也许每天玩几小时的,填字游戏，依然让人兴致盎然。

耶鲁公开课 - 死亡课程节选

But imagine doing crossword puzzles every day for 10 years, 1,000 years, a million years, a billion years, a trillion years.

但想象往后每天做填字游戏，玩上十年，一千年以至永远。

耶鲁公开课 - 死亡课程节选