a man or woman 可以说成a man or a woman 有什么区别?and 前后不是结构对应的?这里为什么可以不用a 还有其他的类似的情况吗?

a man or woman 可以说成a man or a woman 有什么区别?and 前后不是结构对应的?这里为什么可以不用a 还有其他的类似的情况吗? Guess I am a man or woman? Who is more powerful,a man or a woman? a,woman,man,salesperson,can,be,or,either （连词成句） 翻译英语短文a girl or a boy,a woman o a man Waiting for a woman man,Waiting for a woman man... a one man or one woman research project是什么意思?Each individual in this country should be forming a one man or one woman research project.a one man or one woman research project是什么意思? Are you a male or a female?是否需要a 还有这个 Are you a man or a woman? MAN OR WOMAN right man or woman man or woman?中文翻译 to know!Anyway,no matter who you are,whether you are a man or woman, Not a man or woman is worth your tears for him If you had a choice,could you choose to be a man or woman?why or why not? between a man and a woman 歌词 A Man and a Woman 歌词 A woman born to a man riding 被别人问 Are you a man or woman在email里,被外国同事问Are you a man or woman?怎么能幽默点儿回答（in English）.I am a man.