膝高 meaning in Chinese

knee height

Detemination of the normal value of knee height in pre - school children in chongqing
重庆市学龄前儿童膝高正常值测定
The first , at shin height , is for the trays on which the runners take the food up the two flights of 10 stairs each to the restaurant and to which they must return every empty tray
第一个大约及膝高的架子是放置盘碟，从厨房到餐馆有一个10级的楼梯，每个跑堂负责两级台阶，依次将食物递上去，回头再把每个空盘碟放回去。