上下
上下[shàng xià]1.■（职务、辈分上的高低） high and low; old and young:the whole nation;举国上下All members of the family, old and young, are very pleased.全家上上下下都很高兴。2.■（从上到下） from top to bottom; up and down:The water tower is fifty metres high.这个水塔上下有50米。3.■（从高到低或从低到高） go up and down:With an elevator in the skyscraper, we can easily go up and down.摩天楼里有电梯，上下很方便。4.■（程度高低） relative superiority or inferiority:equally matched; about the same;不相上下hard to tell which is better难分上下5.■（用在数量词后面） about; or so; or thereabouts:about thirty years old; thirty or so30岁上下上下配穴 {中医} coordination of the acupoints of the upper with those of the lower, superior-inferior point association上下钳口 bit (pl. bits)上下升降 oscillation
