本身就是复数的词 眼镜glasses; 耳机earphones; 鞋shoes;裤子trousers等词本身是复数。 如:My glasses were on the chair just now. 但如果表示这双,这副,一双的时候用单数 如:There is a pair of chopsticks on the plate. This pair of earphones is for you.
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