曲柄

例句：

1. 1. The car has a concave front and a curved rear wheel.
   这辆车有一个凹面前部和一个弯曲的后轮。
2. 2. The bike has a straight handlebar and a flat seat.
   这辆自行车有一个直的把手和一个平坦的座位。
3. 3. The chef used the handlebar to lift the heavy pots and pans.
   厨师用把手提起了沉重的锅和盘子。