上下: and -- one of the six catego ...键: key上下键把光标移动到如图处: bios features setup下键盘: lower manual keyboard向下键: down key上下: 1.(职务、辈分上的高低) high and low; old and young 举国上下 the whole nation; 全家上上下下都很高兴。 all members of the family, old and young, are very pleased.2.(从上到下) from top to bottom; up and down 这个水塔上下有五十米。 the water tower is fifty metres high.3.(从高到低或从低到高) go up and down 摩天楼里有电梯, 上下很方便。 with an elevator in the skyscraper, we can easily go up and down.4.(程度高低) relative superiority or inferiority 不相上下 equally matched; about the same; 难分上下 hard to tell which is better5.(用在数量词后面) about; or so; or thereabouts 三十岁上下 about thirty years old; thirty or so按一下键盘上的: print screen在拷贝前提示你敲一下键: promptsy outo press a key before copying; promptsyoutopre akeybeforecopying; promptsyoutopressakeybeforecopying吊上下: pick u30” conductor handling slings and shackles上下,来回: uand down上下班: on/off duty上下唇: the lips上下的: superior inferior上下动: seesaw; teetertotter上下法: uand down method上下飞: heave上下界: u er and lower bound; upper and lower bound上下客: pick up-drooff上下铺: a double bed room double decker上下索: parbuckle上下跳: (jump) uand down; jumuand down上下文: 1.(书中或文章中某一段或某一句前后的部分) context 你能从上下文猜出那词的意思吗? can you guess the meaning of the word from the context?2.[计算机] context; 上下文关系 [计算机] context; 上下文说明 contextual declaration; 上下文相关 context dependent; 上下文自由语言 context-free language上下弦: upper and lower chord上下限: bound; limiting sphere; toand bottom limitation; u and collars; upper and lower limits; ups and collars上下肢: upper and lower limbs