So if we add them all up, there should be no net charge on the molecule, if the molecule is neutral.
因此如果我们把它们都加起来，这个分子上应该没有净电荷，如果这个分子是中性的话。
So that means if we add up all of the formal charges within the molecule, what we would expect to see is that they sum up to give a net charge of negative 1.
那么这就意味着如果我们把这个分子中，所有的形式电荷加起来，我们应该会看到它们加起来，之后得到的净电荷量为负一。
So we can do this for any final charge we have, if we have a molecule that has a charge of plus 2, then all of the formal charges should add up to plus 2 and so on.
对于任意净电荷的情况，我们都可以这样做，比如假设我们有一个带两个正电荷的分子，那么所有的形式电荷加起来应该等于正二，等等。
Many gas stations will charge you a slightly lower rate if you pay cash instead of credit, which could add up over multiple fill-ups.
如果你付现金的话，许多加油站收的钱会稍稍比你用银行卡结算要低一些，长期积累下来也能省出不少。
Most restaurants automatically add a 10% service charge to the bill, but the surcharge often ends up in the pocket of the owner.
大多餐馆自动在账单里加了10%的服务费，但这笔额外的收入最后却常常落到雇主手里。
Most restaurants automatically add a 10% service charge to the bill, but the surcharge often ends up in the pocket of the owner.
大多餐馆自动在账单里加了10%的服务费，但这笔额外的收入最后却常常落到雇主手里。
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