“上下跳动”可以翻译为 bounce up and down 。例如:The ball bounced up and down on the ground.(球在地上上下跳动。)
此外,根据具体语境,也可以用其他表达,如 jump up and down (更强调有节奏地、反复地上下跳,可用于描述人或物体),例如:The children were jumping up and down with excitement.(孩子们兴奋得上蹿下跳。)