| 释义 |
●up and down- rising and falling起伏；上下波动；颠簸◆We knew she was still alive – her chest was moving up and down.我们知道她还活着 —— 她的胸部还在起伏。◆The kids were jumping up and down with excitement.孩子们兴奋得上下直跳。
- backward and forward来来回回◆He was running up and down the block, screaming with pain.他在街区里来回跑，疼得直叫。
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