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針織套衫
A jumper is a warm knitted piece of clothing which covers the upper part of your body and your arms.
例句
Isabel had on a simple jumper and skirt.
伊莎貝爾穿著素凈的針織套衫和裙子。
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（穿在襯衫或毛線衫外的）無袖連衣裙
A jumper is a sleeveless dress that is worn over a blouse or sweater.
例句
She wore a checkered jumper and had ribbons in her hair.
她穿著格子連衣裙，頭上系著絲帶。
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善跳躍者；跳躍的人（或動物）
If you refer to a person or a horse as a particular kind of jumper, you are describing how good they are at jumping or the way that they jump.
例句
He is a terrific athlete and a brilliant jumper...
他是個出色的運動員，彈跳力非常好。
Horses are not natural jumpers.
馬并不是天生就善于跳躍的。
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跳躍運動員
A particular kind of jumper is an athlete who takes part in a particular jumping event.
例句
Packer began her career as a long jumper.
帕克開始運動生涯時是個跳遠運動員。