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umbrella [ʌmˈbrelə] n. 雨伞

英英解释（牛津词典）：

an object with a round folding frame of long straight pieces of metal covered with material, that you use to protect yourself from the rain or from hot sun

umbrella的特点：

一种物品（an object）它有圆形可折叠的框架，由长而直的金属块构成，上面覆盖有材料（with a round folding frame of long straight pieces of metal covered with material）你用来保护自己不受雨水或炎热的太阳（that you use to protect yourself from the rain or from hot sun）