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He waved back, put down the kickstand, and took off his helmet.

他向后挥挥手，放下撑脚架，并脱掉他的头盔。

《柯林斯英汉双解大词典》

In 'come back', 'break down' and 'fall off', 'back', 'down' and 'off' are all adverbial particles.

在come back、break down和fall off中，back、down和off都是副词小词。

《牛津词典》

And when it falls back down that energy is given off.

当它回去的时候,它的能量也消耗殆尽了。

麻省理工公开课 - 固态化学导论课程节选

Bent then came the closest to a home goal all afternoon with a stunning 25-yard free-kick that crashed back down off the bar and to safety.

BBC: Sunderland 0-2 Blackpool

It is easy to lose your footing, and tumble back down, bouncing off the steps like the sacrificial victims of a thousand years ago.

BBC: The kingdom of the crystal skull

Instead it was Flintoff who applied the coup de grace with a solid thump straight back down the ground over the ropes off Harris, to give England heart going into the one-day matches that begin with a Twenty20 international on 20 August.

BBC: Pietersen reign starts with a win