“轮换”造句

他们轮换驮着对方。
They give each other piggy-back rides.

这个车间的工人上白班和上夜班每周轮换一次.
The workers in this workshop do day and night shifts in weekly rotation.

在交通信号轮换到绿灯以前不要穿过马路.
Before the traffic signal turns to green light don't cross the street.

• #轮换