on prep.在...之上；由...支撑着；在（某一天）；关于；基于adv.穿着；向前（移动)；表示持续性adj.表示已连接、处于工作状态或使用中；发生；值班
详细释义
Adverb:
on hands and knees;
"he got down on all fours to play with his grandson"
双语例句
Forced to reveal the truth at last, Rochester takes Jane to the forbidden chamber on the third floor where Jane sees a hideous creature, crawling on all fours in her madness. 罗切斯特最终被迫吐露真情，他把简带到三楼的那间禁室，简看见一个丑陋可怕的女人，正疯疯癫癫地用四肢在地上爬行。
The baby was crawling about on all fours. 婴儿那时正在满处爬。
The baby often crawls on all fours. 婴儿经常爬行。
The drawing is on all fours with the scene at that moment. 那幅画和当时的景象完全一致。
