The car began to roll back down the hill.

汽车开始倒着往山下滑。

《牛津词典》

For those of you who may not remember, Sisyphus, of Greek mythology, was the guy condemned to push a boulder up a hill, watch it roll back down, and repeat this for all eternity.

有些人可能不记得希腊神话里西西弗这个人了。他将一块巨石推上山顶，看着它从山顶滚下来，然后一生重复做这件事。

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But with every roll, it picks up more and more snow until it becomes a big snowball rolling very fast down the hill.

但是随着每一次滚动，它会吸收越来越多的雪，直到变成一个大雪球飞快地滚下山。

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The soreness might have been brought on by dancing to the music blaring out of a giant roaming toad, or maybe it was biking around the festival or perhaps it was the questionable decision to roll down a hill.

BBC: A festival of childhood imagination