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爱收集（无价值物品）的人;爱收藏（破烂）的人
If you describe someone as a magpie, you mean that they like collecting and keeping things, often things that have little value.
例句
A born magpie, Mandy collects any object that catches her eye.
曼迪天生喜欢收集小玩意，只要是她看上的都会收藏起来。