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Occasionally, you'll find you need to cancel out units, because, of course, you're always doing unit analysis as you solve your problems, and sometimes you'll need to convert joules to kilogram meters square per second squared.
偶然地，你会发现需要消除单位，因为在解题时,经常要做单位分析，所以有时候需要把,焦耳换做,一千克乘以米的平方除以秒的平方。
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But in terms of SI units, which become much more useful if you're actually trying to use intensity in a problem and cancel out your units, we're just talking about joules per second is what intensity is.
但是用国际单位制，这个变得越来越有用了,如果你实际上在使用强度,来解决问题和约化单位，我们仅仅讨论每秒钟的焦耳,这就是强度。
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.. The more they covary--they move together-- the less they cancel out.
共变的趋向越大。。。它们一同增减-,风险越不会抵消。
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p1V1/R That p2 V2 over R, and then I have p1 V1 over R, the R's cancel out.
就是p2V2/R除以，两个R消掉了。
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It's mortality that gives it that sense of ephemeral value, but it's also mortality that threatens to cancel it out altogether.
因为逃不过必死的结局所以给了美朝生暮死的价值，但必死性也可能带来全盘出局的威胁。
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They cancel each other out. So, you know, The frontal of the fighting has been borned by the US, the UK, Canada, France, Holand and Denmark.
他们相互抵消了，前线战争是由,美国，英国，加拿大，法国，荷兰，丹麦。
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The two sources of charge cancel each other out.
两个电荷源互相抵消。
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pxa So what happens when we add a 2 p a and we subtract from it a 2 p x b, or the same with a 2 p y a subtracting a 2 p y b, is that we're actually going to cancel out the wave function in the center, so we now have 2 nodal planes.
当我们用,减去2pxb时，或者是2pya减去2pyb时，我们会消去,中间的波函数，所以现在我们有两个节面。
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In addition to that, we have that epsilon nought value, remember that's the permittivity constant in a vacuum, and basically that is what we use as a conversion factor to get from units. We don't want namely coulombs to units, we want that will allow us to cancel out in this equation.
这是电子的电荷，此外，我们有epsilon零，记住这是真空的介电常数，这是我们用来转换单位的转换常数,我们不想用库伦单位，我们希望这个可以在方程中约去它。
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It turns out that if you make them forfeit their cash value on canceling, then they won't cancel.
但是如果你规定保单的现金价值,会随保单的取消而消失,他们就不会这么干了
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