Electron affinity, however, can be either negative or it can be positive.
但是，电子亲和能既可以是负的，也可以是正的。
Each electron bears a single negative charge.
每一个电子都带有一个负电荷。
A proton has positive charge and an electron has negative charge.
质子带正电荷，电子带负电荷。
We have the minus because we're adding a negative charge from the electron.
有这个负号的原因是，我们得到一个电子后增加了一个单位负电荷。
An electron has a negative charge, a proton has a positive charge.
电子带负电荷，质子带正电荷。
An electron has a negative charge, a proton has a positive charge.
电子带负电荷，质子带正电荷。
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