| 单词 | bob up and down |
| 释义 | bob up and down1.■上下跳动：The cork on a fishing line bobbed up and down on the water.钓丝上的浮子在水面上下跳动。The girl bobbed up and down in the water, waving for help.姑娘在水中上下晃动，挥手呼救。 |
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