But nearly one-half of its people live on less than $1 per day.

VOA: standard.2009.10.19

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

But that's not enough because computers at the end 1 of the day only understand 0s and 1s and what you and is clearly not a collection of 0s and 1s.

但是仅仅这样是不够的，计算机,最终只会认识0和,你现在得到的，c的文件显然不是0，1的合集。

哈佛公开课 - 计算机科学课程节选

First of all, negative time should not bother anybody; t=0 is when I set the clock, I measured time forward, but yesterday would be t = -1 day, right?

首先,负的时间对我们不存在任何干扰,t=0使我们设定的初始时间,我是用顺序计时,所以昨天就可以记为-1天,对吗

耶鲁公开课 - 基础物理课程节选