I felt it funny to run up and down the hill.

我觉得在山上这样跑来跑去真是太好玩了。

Run up and down the stairs until your legs are lighting up.

在楼梯上跑上跑下,直到你的腿觉得轻松了.

Others merely run up and down the bank on this side.

很少人可以到达彼岸，其他人只是在这岸边跑来跑去。

Overuse or sudden twisting can injure the muscles that run up and down your back .

过度或突然扭可损害肌肉上运行的上升和下降，你的背部。

And being too busy, and too old then, to run up and down amusing her, I hit on a method by which she might entertain herself.

而且我忙了，也太老了，不能跑上跑下的逗着她玩，我就想出一个办法让她自己娱乐。

He'd felt like he'd run up and down the stairs a few times, but even that was an improvement over the bone-deep weakness he'd been battling all year.

这让他觉得自己像是楼上楼下奔跑了好几趟似的那样累，但是这也这一年来对抗深入骨髓的虚弱的进步。