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jacket [ˈdʒækɪt] n. 夹克

a piece of clothing worn on the top half of the body over a shirt, etc. that has sleeves and fastens down the front; a short, light coat

jacket的特点：

一件衣服（a piece of clothing）穿在身体上半部分（ worn on the top half of the body）包含手指和拇指（over a shirt, etc）它有袖子，前面有扣子（that has sleeves and fastens down the front）一个短的、轻的外套（ a short, light coat）