foot rest crank arm

例句：

1. 1.The office chair has a footrest to support my back while I work.
   办公椅有一个脚托，让我在工作时能支撑我的背部。
2. 2. After a long day at the gym, she needed a footrest to relax her sore feet.
   在健身房度过了漫长的一天后，她需要一个脚托来放松她的酸痛的双脚。
3. 3.The car seats have adjustable footrests for comfort.
   汽车座椅有可调节的脚托，以提供舒适。