Were you ever knocked by others because of the dark?

你曾经因为黑暗而被别人撞到过吗？

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The cyclist was knocked down by a truck.

骑车的人让一辆卡车撞倒了。

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He died after being knocked down by a car.

他被一辆汽车撞倒后死了。

《柯林斯英汉双解大词典》

Behaviorism looks at the human entity, at the person as basically a collection of behaviors as a box, like a billiard ball knocked around by reinforcements, by punishment, by reward.

行为主义认为人的主体性，认为人是一个行为集合，就像一只被击打而四处滚动的台球，被增强，奖惩驱动。

哈佛公开课 - 幸福课课程节选

Confidence in the euro has also been knocked by the conflict in Kosovo, in Europe's backyard.

ECONOMIST: Eurotrash?

It comes as the group reported a 58% fall in half-year net profit, knocked by weaker metal prices.

BBC: Marius Kloppers

Leading US car firms have all been knocked by an over-reliance on thirsty pick-ups and SUVs, at a time when more American drivers are switching to smaller more economical cars.

BBC: NEWS | Business | DaimlerChrysler cuts 13,000 jobs