treadle pedal

例句：

1. 1.The old bicycle had a treadle pedal that was difficult to operate.
   这辆旧自行车有一个难以操作的脚踏板。
2. 2.The car has a treadle pedal for the driver to control the speed.
   这辆车有一个脚踏板，供司机控制车速。
3. 3.The farmer used a treadle pedal to turn the plow.
   农民使用脚踏板来转动犁。