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So, a massless body cannot have a net force on it, because the acceleration of the rope cannot be infinite.
所以没有质量的物体不会受到力,因为绳子的加速度不可能是无穷大
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And this is important because it means that since we cannot observe, we cannot talk about individual electrons.
这很重要,因为这意味着我们不能观察，不能谈及单个电子。
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We know very well, by the way, that there are scientists who simply cannot stand to read poetry because it's false, right?
我们清楚的知道，有些科学家,不能忍受诗歌因为他们认为诗歌是伪造的？
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You cannot have a spring pulled only at one side, because then it will then accelerate with infinite acceleration in that direction.
你不可能对弹簧只施加一边的拉力,因为那样的话弹簧就会以无穷大的加速度加速,就在这个方向上
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Because it challenged the whole class system, that people are born into a certain place and cannot-- and should not-- be moved.
因为它挑战了整个阶级体系，人生来就有阶级，不能-,也不应该被改变。
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That's unethical behavior because it -if you keep trading too much, then you cannot possibly make money.
这是不道德的行为,因为,如果你一直过度交易,那你基本不可能赚到钱
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What do I learn from the period? How？ Remember, you cannot peek into Chapters 6 and 7, because you've seen it before.
我能利用周期得到什么结论,怎么做,记住,你不能跳到第六章和第七章,即使你看过了
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But the mathematicians told Dirac, "You cannot ignore the negative energy solution because it tells you there's a second solution and you cannot throw them out."
但数学家们告诉狄拉克,你不能忽略负的能量,因为数学告诉我有两个根,你不能随便丢掉
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I cannot even make it look hard because I have memorized this problem from childhood, so there is no way I can make this look difficult.
我不会让这些问题变得看起来复杂,因为这些问题我童年时就熟记于心,我无法让它变得复杂
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There's only one occasion where it helps to go to three dimensions because there are certain things you can do in 3D you cannot do in less than 3D.
只有一种情况下进入三维是有意义的,因为有些事情你能在三维空间内完成,但低于三维就做不到了
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So you cannot use the formula once it hits the ground because once it hits the ground, the fundamental premise that a was a constant of -9.8 or -10 is wrong.
当物体落地以后,该公式就不适用了,因为当物体落地后,公式的基本前提——,加速度为常数-9.8或-10——就不成立了
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