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$V_O = \frac{1}{4 \pi \epsilon_0} \left( \int_{\text{剩余球壳}} \frac{\sigma \, \mathrm{d}A}{r} + \int_{\text{切割面}} \frac{\sigma \, \mathrm{d}A}{r} \right).
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创造力最重要的不是发现前人未见的,而是在人人所见到的现象中想到前人所没有想到的——薛定谔