ax·le /ˈæksəl/
 輪軸,車軸
 Ax·le n.
 1. The pin or spindle on which a wheel revolves, or which revolves with a wheel.
 2. A transverse bar or shaft connecting the opposite wheels of a car or carriage; an axletree.
 3. An axis; as, the sun's axle.
 Had from her axle torn
 The steadfast earth.   --Milton.
 Note: ☞ Railway axles are called leading and trailing from their position in the front or in the rear of a car or truck respectively.
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 axle
      n : a shaft on which a wheel rotates