a third classroom什么意思?There is a fourth boy in the

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(区别于前两间的)第三间教室
房间里还有第四个男孩儿呢.
a +序数词与the +序数词的主要区别在于
a后面的序数词不强调次序上的差别而the 后面则强调
a fourth boy就是说有第四个人可能刚才是看漏了以为只有3个
the fourth boy是指强调排名第四个不是第一二三
比如
Tom is a fourth boy come in the room.
汤姆是进房间的第四个男孩儿.(暗含的意思是另外还有3个后面也可能还有别的)
Tom is the fourth boy come into the room.
汤姆是第四个进房间的男孩儿.(暗含意思是他来晚了、或者很早就来了)
这样应该清楚了吧

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