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。

youdao

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。

youdao