单词学习：axle 名词 (机械/工程)
axle
/ˈæksl/
车轴，轮轴，轴
The mechanic explained to Teacher Gu that the car's front axle needed to be replaced.
机械师向顾老师解释，汽车的前轴需要更换。
单词卡片
卡片已就绪
