una corda pedal

例句：

1. 1. The car has a hydraulic pedal for the driver to control the speed.
   这辆车有一个液压踏板供驾驶员控制车速。
2. 2. The bike has a simple pedal system that allows you to adjust the gears.
   这辆自行车有一个简单的踏板系统，可以让你调整齿轮。
3. 3. The dancer used a pedal to control the rhythm of the music.
   舞者使用踏板来控制音乐的节奏。