名詞 axle:

1. a shaft on which a wheel rotates

1. The garage mechanic find a crack in the back axle of the car.
   汽車修理廠的機(jī)修工發(fā)現(xiàn)汽車的後車軸上有一條裂縫。
2. The part of a machine shaft or axle supported by a bearing.
   軸頸機(jī)械的轉(zhuǎn)動軸或輪軸中由軸承所支撐的部分
3. The back axle of the bus was broken.
   公共汽車的后軸斷了。

ax.le

n.（名詞）
A supporting shaft or member on or with which a wheel or a set of wheels revolves.
車軸，輪軸：一個輪子或一組輪子在其上或圍繞其轉(zhuǎn)動的支撐桿或部件

The spindle of an axletree.
車軸軸心
Either end of an axletree.
軸端：車軸的任一端

來源：
Middle English axel
中古英語 axel
from Old Norse ôxull
源自 古斯堪的納維亞語 ôxull