Directed, occurring, or taking place, alternately upward and downward.
单词 | θ106117 |
释义 | the world > movement > motion in specific manner > alternating or reciprocating motion > [adjective] > up-and-down (2) up and down1616 Directed, occurring, or taking place, alternately upward and downward. pump-handle1820 attributive. Applied to action or movement resembling the working of the handle of a pump. |
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