序数词的前面为什么+the

序数词的前面为什么+the

序数词前面一般要加定冠词the.
比如:
I have three sisters.
I am the first one to come here.
between the two birds 表示“在这两只鸟之间”,这里是特指这两只鸟,要用定冠词the,可the并不是修饰数词的,而是修饰后面的birds.
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