笔记： 

hamburger 汉堡包（牛肉堡）

看 hamburger 的定义：hamburger is a round flat piece of minced beef, fried and usually eaten between two halves of a bread roll. 

minced beef 搅碎的牛肉末，只有两片面包中间夹了牛肉末做的牛肉饼的才能叫做 hamburger.

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