training wheels是training wheel的复数

training wheel

美 
英 
  • n.(儿童自行车后轮两侧的)稳定轮
  • 网络辅助轮;辅助措施;训练轮
复数:training wheels  
training wheels
n.
1.
(儿童自行车后轮两侧的)稳定轮small wheels that are fitted at each side of the back wheel on a child's bicycle to stop it from falling over
— see also
stabilizers

例句

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