On the descents, cyclists spin past cars, freewheeling downhill at tremendous speed.

在下坡道上，自行车手们飞快地掠过汽车，靠惯性极速冲下山去。

《柯林斯英汉双解大词典》

We picked up speed as we went downhill.

下山时我们的速度加快了。

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With a great deal 'of bustle, muttering reproaches to itself, the Dwarf half led and half supported Shasta at a great speed further into the wood and a little downhill.

小矮人大大的一阵忙乱，喃喃地责备着自己，半搀半扶地赶快把沙斯塔带进树林，稍稍走下山去一点儿。

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Mike actually holds the world record for downhill speed skiing for blind person, which is 60 miles an hour.

实际上,迈克是盲人高山滑雪的记录保持者，速度达到了每小时60英里。

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Or for something more adrenaline-filled, the long-standing weekly Zoobombing meet up, held every Sunday evening, is where die-hard speed demons take part in high-speed, downhill bike races.

BBC: Portland's urban adventures

To return to the matter of stopping: The Stealth-X designers envision riders controlling their speed by carving like a downhill skier and stopping by kicking the sled sideways in a skilike spray of snow.

WSJ: Snolo Stealth-X Review: A Pricey Way to Zip Down Your Private Mountain | Rumble Seat by Dan Neil

More super-G racers are disqualified for missing a gate than in downhill because of the speed and frequency of turns.

BBC: Sport - Winter Sports - Alpine skiing: Super-G