Standing still and cooling his brow, he saw a boy running down the hill at topmost speed.
他站着一动不动，冷却着发热的额头，看见一个男孩以最快的速度从山上跑下来。
My mom took a deep breath and pushed down on the top pedal just the way I'd shown her. Slowly the bicycle rolled forward, picking up speed as it coasted down the hill.
我往车后退了两步，妈妈深呼了一口气，将踏板踩到底部，就像我刚才教她的一样，慢慢地，自行车往前滚动了，沿着山坡往下，车的速度越来越快，前轮开始快速地晃动。
Remember riding your bike as a kid, pretending to go at warp-speed down a hill?
还记得你小时候骑单车的时候，曾经尝试着从山上冲下，来达到曲速速度吗？
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