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No, we call that work positive work. All right, so that means we need to put a negative sign right here, by convention.
历史上有过不同的习惯，这里我们规定,如果环境对系统做功。
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The weather. I mean, right now, it's negative five degrees and there's a blizzard in Boston and
主要是天气。现在这里是零下5度，但在波士顿就已经暴雪不断了，
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If it's an African American or a bad word, a negative word, I want you to shout out "right," this side, "right."
如果是黑人，不好的词，或贬义词，你们就大叫喊”右“，这边，”右“
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No, we can't. Because if l equals 1, we can not have m sub l equal negative 2, right, because the magnetic quantum number only goes from negative l to positive l here.
不行，因为如果ｌ等于１,ｍｌ的值不可能等于－２，对吧，因为磁量子数的值,这时只能从－１到１
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This is the negative heat of formation, right?
这里是负的生成热，对吧？
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We could say-- you could imagine somebody saying, Williams" "Oh yes, you're right, Williams, " the contents get negative, " but that's still outweighed by the mere fact that you're alive.
我们可以说-,可以想象有些人会说，“你说得对，“生活内容的部分总和是负数，“但它还是会被你活着这个事实超越。
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The molecule is net neutral, but this right end is a little bit more negative and the left end is a little bit more positive.
这分子是电中性的，但右边要带一点负电荷,而左边要带一点正电荷。
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So, if you have any negative numbers you'd have a problem, right?
所以如果中间有负数就会有问题
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Right. X is negative. X is -16.
好，如果x是负的呢？
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It says, if you pull it to the right, so that x is positive, the spring will exert a force which is in the negative direction; that's why you have a minus sign.
就是说,如果你向右拉,x 取正值,弹簧产生的力方向为负,这就是这里用负号的原因
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Negative pressure doesn't make any sense, right?
负的压强没有意义？
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So this is the negative number, right?
所以它是负数，对吧？
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