The teeth on the gears mesh as they turn round.
转动时齿轮上的齿与齿相啮合。
The teeth on the gears mesh as they turn round.
转动时齿轮上的齿与齿相啮合。
The statue of General Sedgwick, cast from cannons captured by the VI Corps which he commanded during the Civil War, has rowel spurs that turn.
塞吉维克的塑像由一门他在内战中领导的六团缴获的大炮
，
围是马刺上的小齿轮。
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