“±” 表示正或负，正负号在数学中可以用来表示有理数的正负或者对数进行四则运算中的加减运算。正负号在中学物理中不是单一的概念，它有的等同于数学中有理数的正负，有的则用来表示物理量的性质、方向，情况较为复杂。
网络释义专业释义
双语例句原声例句
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现在必须介绍曲率半径的正负号规则。
It is now necessary to introduce a sign convention for radii of curvature.
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啁啾参数的正负号不影响横向光强分布和光谱分布。
The sign of chirp parameters has no effect on the spectral distribution and transversal intensity distribution.
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如果你们比较s轨道和下面这叶，它们正负号相反，所以它们相消干涉。
If you compare the s orbital with the bottom lobe, these have a different sign so they're going to destructively interfere.
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If you compare the s orbital with the bottom lobe, these have a different sign so they're going to destructively interfere.
如果你们比较s轨道和下面这叶，它们正负号相反,所以它们相消干涉。
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So I changed the colors here to show that these are 2 p orbitals with an opposite phase or an opposite sign.
我这里换了一种颜色,表示2p轨道,不同的相位或者是正负号。
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