cap [kæp]

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n.帽子，便帽；帽状物

a soft flat hat which has a curved part sticking out at the front , often worn as part of a uniform

Why don't you put on your cap? 干吗不戴上帽子？
Quick, catch my cap before it blows away! 快，抓住我的帽子，别让它给风吹走！