axle·tree /-(ˌ)tri/
輪軸,車軸
Ax·le·tree n.
1. A bar or beam of wood or iron, connecting the opposite wheels of a carriage, on the ends of which the wheels revolve.
2. A spindle or axle of a wheel. [Obs.]
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axletree
n : a dead axle on a carriage or wagon that has terminal
spindles on which the wheel revolve