答案是：一串 a set of 比如：a set of keys 一串钥匙 ~手工翻译，尊重劳动，欢迎提问，感谢采纳！~麻烦采纳，谢谢!
a pair of a cup of a bar of a bottle of
a pair oftrail stringa cup ofa bar ofa bottle of
a string of a trail ofa bunch of
a bunch of grapes.a bunch of keys.a string of pearlsa string of beads.
A bunch of bananas two bunches of bananas
a bunch of grapesa cluster of grapes
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哈西哈西哈西
