swin arm

例句：

1. 1. The child was swinging on the swing set when it suddenly broke.
   当秋千突然断裂时，那个孩子正在荡秋千。
2. 2. The old man was swinging his cane around in circles.
   老人在圈子里挥舞着他的拐杖。
3. 3.The baby was swinging high in the air, looking down at the world below.
   婴儿在空中高高摇摆，向下看着下方的世界。