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？
I try to keep my speed up for an extended period of time after a down hill.
我是保持我的速度，在下坡之后再维持一段时间。
The car gained speed as it went down the hill.
公共汽车下山时速度加快。
Be careful when you drive down this hill, for the rigidly enforced speed limit is 20 MPH.
开车下山时要小心，因为车子限速是每小时20英里。
Be careful when you drive down this hill, for the rigidly enforced speed limit is 20 MPH.
开车下山时要小心，因为车子限速是每小时20英里。
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