Be careful when you go up and down the stairs.
上下楼梯时要小心。
He strutted up and down before the manager.
他在经理面前大摇大摆地走来走去。
He paced up and down for a long time before he lay down; but, when he did finally lay himself down, he fell asleep.
医生在睡觉之前来回走了许久,但终于躺下之后便立即睡着了。
Ravenous beasts freely roved up and down the country.
贪吃的野兽随意出没在乡间。
Colour this clown, up and down.
给这个小丑涂色。上上下下。
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