get down on his knees为什么是用on 不能用with ,

问题描述:

get down on his knees为什么是用on 不能用with ,

get down on his knees 双膝跪下
介词 on 表示用身体的某个部分来支持身体:
stand on one's hands 倒立
lie on one's back/stomach 仰躺着/ 俯躺着
get down on one's right knee 右膝着地跪下去