n.翻筋斗者;<机>转臂;(机枪的)机心;(玩具)不倒翁;
例句:
It has similar shape to a tumbler but is much smaller.
它的形状类似于平底玻璃杯,但是比平底玻璃杯小很多.
He drank from a tumbler.
他用平底玻璃杯喝.
He was a tumbler when he was young.
他年轻时是个翻筋斗的杂技演员.