[Jane Lindholm] So when you pedal you're turning the chain ring. That's the circle thing that looks like it has teeth on it. Those teeth move the chain which moves the back wheel.
那是看起来像上面有牙齿的圆形东西。 这些齿移动链条， 链条移动后轮。
Chain Ring
原声例句
but why
英语百科
Crankset
The crankset (in the US) or chainset (in the UK), is the component of a bicycle drivetrain that converts the reciprocating motion of the rider's legs into rotational motion used to drive the chain or belt, which in turn drives the rear wheel. It consists of one or more sprockets, also called chainrings or chainwheels attached to the cranks, arms, or crankarms to which the pedals attach. It is connected to the rider by the pedals, to the bicycle frame by the bottom bracket, and to the rear sprocket, cassette or freewheel via the chain.
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