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Every force, with one exception, can be seen as a force due to direct contact with the body.
除了一个例外,其它所有力必须要和物体有直接接触
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It's perfectly impossible, I think, to imagine a stronger statement than this of the authority that Milton gives, the intellectual self-possession that he ascribes, to the individual.
我认为这完全是有可能的，去想一个比弥尔顿,这个理论更有力的论述，他认为每个个人拥有的沉着冷静和泰然自若。
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His shield, in addition to being a defensive thing, is also potentially an offensive weapon.
他的盾牌,除了能提供防御和保护之外,同样也是一个潜在的有力武器
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That's this powerful idea taken over from Locke by Jefferson in the Declaration.
这就是杰斐逊在《自由宣言》里所引用的,洛克的一个强而有力的主张。
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There are many pro-slavery writers who developed, like James Henry Hammond, what I would call the cynical or amoral form of pro-slavery argument; and this is a potent form of argument when you think about it.
另外还有很多亲奴制的作家有一些,比如詹姆斯.亨利.哈蒙德,我称之为愤世嫉俗的,或不道德的亲奴制的论断,细想之下你们会发现这是一个很有力的论断
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Right now at this point in our course, whenever you have a problem where there is some body and someone says, "Write all the forces on it", what you have to do is very simple.
现在在我们这个课程里,如果你遇到一道题目,题目给了你一个物体,并要求你,"写出该物体所受的所有力",你要做的其实很简单
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It was very impactful to start a book that way because I doubt that hardly any readers actually write out a check on the spot to UNICEF; but if you don't, then you are in some sense responsible for the loss of 30 lives.
这是一个有力的开场白,因为我认为几乎不会有读者真的,会写张支票把钱寄给联合国儿童基金会,如果你无动于衷,那么你在某种意义上,要为那逝去的30个生命负责
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It looks like a tautology because you're never able to show me something that moves forever at a constant velocity, because every time you don't find such a thing, I give an excuse, namely, a force is acting.
这听上去像个死循环,因为你不可能,找到永远匀速运动下去的物体,因为每当你找不到这样的物体时,我就会给出一个理由,也就是,有力作用在上面
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The free-body diagram, it says you can pick any one body that you like and apply F = ma to it, provided you identify all the forces acting on that body.
所谓隔离法,就是说你可以任意 选取一个物体,分析出它所受的所有力后,单独对其运用 F = ma 进行计算
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