One is that 2,000 calories is the average for the typical person, but, of course, people have greatly differing calorie needs.

一是2000卡路里是常人所需的平均值,当然,人们需要的热量是大大不同的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

because the Earth is in need of people becoming more aware of what it needs.

因为地球需要人们的关心。

有很多活动 - SpeakingMax英语口语达人

Now, most of you will say someone that wealthy surely we can tax them to meet the pressing needs of people who lack in education or lack enough to eat or lack decent housing.

你们很多人会说,这么有钱的人，我们当然可以向他收税,以满足那些得不到教育,缺乏食物或者无家可归者的迫切需求。

耶鲁公开课 - 公正课程节选

The other thing about it is that you could make lots of things that are new but generally you think of engineers as making things that are not just new but they're useful, that they do something that needs to be done, and that they do something that improves life, the quality of life of people.

另一个区别是,科学家会做很多很多新鲜玩意儿,而一般来讲,工程师做的东西不只是新奇,它们还很有用,他们做那些需要做的东西,他们做的东西能够提高,人类的生活水平和生活质量

耶鲁公开课 - 生物医学工程探索课程节选