1) tubing reciprocation
油管上下运动
4) Movement of Educated Youth Went to and Worked in Countryside and Mountain Areas
上山下乡运动
1.
Discussing about the Movement of Educated Youth Went to and Worked in Countryside and Mountain Areas in China;
论中国大地上的知识青年上山下乡运动
5) up and down spool movement
滑阀的上下运动
补充资料:上下
①职位、辈分较高的人和较低的人:君臣上下|上下交而其志同也|和上下尊卑等列。②高处与低处;上面与下面。有时具体指天、地,山、泽:上下未形,何由考之|畴若予上下草木鸟兽?③犹言增减:从其爵而上下之。④表示程度的高低,事物的优劣:不相上下。⑤犹言古今:篇章博举,通于上下。⑥犹言前后:上下文|上下要相联,首尾要相应。⑦犹言左右,表示约数:一斤上下|五十岁上下。
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参考词条