Ordered semigroups which can be decomposed into natural ordered bands of 1?archimedean ordered semigroups, nil?extensions of left simple ordered semigroups and left simple ordered semigroups are characterized. ?

• 刻划了分别可分解为左阿基米德序半群、左单序半群的幂零扩张序半群和左单序半群的自然序带的序半群的特征。