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牛奶由水和脂肪构成,它包含着蛋白分子和酪朊,由于它们都带有负电,它们彼此撞击,当牛奶变热时,酪朊会分解掉,这样脂肪聚集到一起结成了块,它们向上浮,形成了一块厚厚的奶皮。这层奶皮妨碍了水蒸汽的逸出,这样形成了压力——它将奶皮向上顶,直到最后蒸汽和牛奶一起涌出来。