The closing entry returns the balance of the revenue account to zero.
结账记录把收入账户的余额还原为零。
On account to cannot be semigroups, so cannot be left (right) zero semigroups absolutely.
因为不能作成半群，故更不可能作成左(右)零半群。
On account to cannot be semigroups, so cannot be left (right) zero semigroups absolutely.
因为不能作成半群，故更不可能作成左(右)零半群。
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