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1. Oxford Dictionary

   training wheels

   英式

   • plural
     a pair of small supporting wheels fitted on either side of the rear wheel of a child's bicycle.
2. • 更多解釋

   training wheels

   • IPA[ˈtrāniNG (h)wēlz]

   美式

   • plural
     a pair of small supporting wheels fitted on either side of the rear wheel of a child's bicycle.

   Oxford American Dictionary