A proton has an electrical charge that is equal to that of the electron, but the proton weighs almost two thousand times as much as the electron.
质子有一个电荷，与电子的电荷相等，但是，质子的重量几乎是电子的两千倍。
When a suBstance has no net electrical charge, the total numBers of positive and negative charges within it must just Be equal.
当物质没有净电荷时，它内部的正负电荷总数必定正好相等。
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