| 释义 |
tread AHD[trĕd] D.J.[tred]K.K.[trɛd] tread water - To keep the head above water while in an upright position by pumping the legs.踩水：身体直立时通过蹬脚使头部露在水面以上
- To expend effort but make little or no progress to achievement of a goal or an end.白费力气：花了很多力气，但是对达到一个目标或目的起的作用很小
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