cap [kæp] n. 帽子
英英解释（牛津词典）：
a type of soft flat hat with a peak (= a hard curved part sticking out in front). Caps are worn especially by men and boys, often as part of a uniform.
cap的特点：
一种类型软的平的帽子有尖顶的（a type of soft flat hat with a peak）帽子被使用特别是男士和孩子（Caps are worn especially by men and boys,）通常作为制服的一部分（often as part of a uniform.）单词选自：
人教精通版小学《英语》三年级
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