音標發(fā)音英式音標 [?tre?.n?? ?wi?lz]美式音標 [?tre?.n?? ?wi?lz]英式發(fā)音 美式發(fā)音 基本解釋（兒童學(xué)騎自行車時安裝在後輪兩側(cè)的）穩(wěn)定輪。同根派生 training wheels相關(guān)詞英英字典劍橋英英字典 small wheels attached to each side of the back wheel of a bicycle to prevent it from falling over when a child is learning to ride ittraining wheels劍橋字典training wheels柯林斯字典