老教育家段力佩先生既是一名思想家，又是一名实干家。

The educationist Duan Lipei was a thinker, and a doer as well.

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该研究的作者奥黛丽·范德梅尔说：“当你手写购物清单或便条时，一段时间后你的记忆力会更好。”

"When you write your shopping list or notes by hand, you simply remember things better after some time," said Audrey van der Meer, author of the study.

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练习一段音乐4个小时需要集中注意力，但它远不及一个在外过夜的14岁女孩对认知的要求。

Practicing a piece of music for four hours requires focused attention, but it is nowhere near as cognitively demanding as a sleepover with 14-year-old girls.

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There are many kinds of work. There's electrical work, take the motor, you plug it into the wall, electricity makes the fan go around, that's electrical work. There's magnetic work.

我们复习一下大一,学过的功的概念：,物体在力的作用下，运动了一段距离。

麻省理工公开课 - 热力学与动力学课程节选

The force, as this weight drops is constant, mgh and so the work is just going to be m g h, h where this is h.

当重物掉落时候的力是恒定的，因此做功就是，这段长度是。

麻省理工公开课 - 热力学与动力学课程节选