约翰比汤姆跑得快。
十年前，光滑的塑料雪橇开始流行起来；它们比木制雪橇跑得快，但是很难操控，也很慢。
Ten years ago, smooth plastic sleds became popular; they go faster than wooden sleds but are harder to steer and slow.
电动自行车比自行车跑得快，而且很容易骑。
Electric bicycles can run much faster than bikes and they are very easy to ride.
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