up and down
The boat , which was swinging in an eddy, came on and off and pitched with violence.
飘荡在旋涡里的渡船, 一上一下猛烈地颠簸起来。
—— 辞典例句You scared me , my heart is thumping up and down.
我的心被你吓得, 一上一下的。
—— 给力词典精选The favorite activity is the seesaw, the ups and downs especially fun for them.
孩子们最喜欢的是跷跷板, 一上一下让他们感到特别开心。
—— 给力词典精选My PALS clean their teeth up and down.
我的朋友们刷牙一上一下的呢。
—— 给力词典精选Head meal meal, and a long beak of a dot on the look out on the water.
脑袋一顿一顿的,长嘴一上一下地在水面打点。
—— 给力词典精选