all fours

例句：

1. 1.The dog is running around in the park with its all fours.
   狗在公园里用它的四条腿跑来跑去。
2. 2.The horse is standing on its all fours to rest.
   马站着用四条腿休息。
3. 3.The baby elephant was born with all fours.
   小象出生时是用四条腿的。