You can think of 'old girl' as a warm label rather than a description. Someone puts 'old' in front of 'girl' the way you put a hand on a friend's shoulder: the words stop measuring the person and start showing that she is already inside the speaker's circle. Which circle it is decides what the phrase means — a street, a family, or a school.
可以想成：old girl 比較像一個親暱的標籤，而不是一句描述。有人在 girl 前面加上 old，感覺就像順手拍拍朋友的肩膀：這兩個字不再是在量年紀，而是在表示「這個人已經在我這一圈裡了」。至於是哪一圈，就決定了整個詞的意思——可能是一條街上的鄰居，可能是家裡人，也可能是同一所學校出來的人。
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