bob up and down

a series of four connected tubes bob up and down in the waters to convert wave motion cleanly into electricity.

一串四个相连的管道在海水中上下浮沉，将波浪运动清洁得转化为电能。

eventually, a field of 10 floating buoys, anchored to the ocean floor, would bob up and down with the swells.

最终，将会有10个固定在海底的浮动浮标随海浪上下起伏。

'these bob up and down as if on elastic. they have a radar detection device to help them avoid spider webs'

这种蝴蝶忽起忽落，就像有弹性一样。它们有一种雷达探测装置，可以帮它们避开蜘蛛网。

jacket. as you've seen on the screen, i bob up and down like

来。正如你们在屏幕上看到的，我像这样突然上

her two little breasts bob up and down, continually, as if they had suddenly begun to swell, bringing her ever closer to perdition.

只见她那对小淑乳一起一伏，抽咽不停，仿佛一下子丰满了起来，成了一对将她进一步带往沉沦之路的豪乳。