"he got down on all fours to play with his grandson"
on all fours的用法和样例:
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。