no jumper没有跳跃者；
jumpern.(毛或棉的)针织套衫；跳跃者；跳跃动物；跳虫
He had no shirt on under his thin jumper
他在薄套头衫里面没有穿衬衣。
He is a terrific athlete and a brilliant jumper
他是个出色的运动员，弹跳力非常好。
Her horse was a show jumper whom the family rescued from the knacker\'s yard.
她的马擅长跨越障碍，是家人从废马屠宰场挽救回来的。
