a. 高及膝盖的
在线英汉词典

knee-high的短语、例句：

knee-high adj 1 high enough to reach the knees 及膝高的
,knee-high `grass 及膝高的草. 2 (idm 习语) knee-high to a `grasshopper (joc 谑) still just a very small child 还是很小的孩子
I´ve known him since he was knee-high to a grasshopper. 他很小的时候我就认识他了.