书上写A third man enterde the room.意思又有第三个人进入房间,这里用A可以吗?为什么呢?

书上写A third man enterde the room.意思又有第三个人进入房间,这里用A可以吗?为什么呢? 请问这里的a third brother who...可以换用定冠词写成 the third brother who.. a third 和 the third有疑惑 The man in the room和There is a man in the room有什么区别? The room is so large that we can take a third bed.的中文意思 one-second 还有two-third又是什么意思?有a half of the children 这种说法吗 when Mr.li sat down,--a third man stood up to speak,为什么the t a third 和 the third This is a third of a pizza.这里为什么不是one third of a pizza 一个房间里有两个开关,为什么开关A开后,开关B可以关呢 a third和the third有什么区别 After a long walk, the old man空格 be tired now这里用should为什么不行?