她一个人在床上爬上爬下，走到卧室门口，打开了门。
She by herself got up and down her bed, walked to the bedroom door and opened it.
这意味着，我们要在山狮居住的山边爬上爬下，虽说我只听到过狮子的声音，从未亲眼见过。
This meant climbing up and down the side of a mountain inhabited by mountain lions, although I should say they were only heard, never seen.
它们绕着树干爬上爬下地互相追逐着，带着一种强烈的快乐和欣喜。
They chased each other round and round the trunk, up and down, with a fury of pleasure and delight.
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