它们常常行走，它们常常游泳，它们常常咧着嘴笑着飞。

They used to walk, they used to swim, they used to fly with a toothy grin.

youdao

它们常常行走，它们常常游泳，它们常常咧着嘴笑着飞。

They used to walk, they used to swim, they used to fly with a toothy grin.

youdao