This principle was famously demonstrated by Galileo Galilei some 400 years ago when he simultaneously dropped cannon and musket balls, and balls made of gold, silver and wood, from the Tower of Pisa.

这一法则是在大约400年前，由伽利略•伽利雷那个著名的比萨斜塔实验所证明的，当时他在塔顶同时释放球型炮弹和毛瑟枪子弹，以及由金、银、木头制成的小球。

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He argued that the effectiveness of policing could be demonstrated not by the number of arrests made or prisoners taken but rather by a lack of crime.

他认为，警方的效能不仅能够通过逮捕或投入监狱的人的数量反映出来，而且能够通过犯罪活动的减少体现出来。

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In a documentary last year, he again demonstrated his numerical powers, this time by breaking the bank in Las Vegas, never having played blackjack before.

在去年拍摄的一部电视记录片中，他展示了自己在数字方面的才能。 尽管从来没有玩过21点（blackjack)，他居然在拉斯维加斯（Las Vegas，美国赌城 --译者注）大赢特赢。

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General Myers says a strong commitment is also important for the Afghan people, who he says have demonstrated they want democracy by voting in very dangerous conditions.

VOA: standard.2009.10.16

And he demonstrated by appointing the Vice President to lead these talks that he is very serious about leading this process to a conclusion that produces serious deficit reduction.

WHITEHOUSE: Press Briefing

He demonstrated the outlandish power of his magic by taking the skeleton of a cow and the skull of a goat, theatrically combining the two before bringing them back to life with a loud belch.

BBC: Bhutan, the kingdom of the clouds

Citing gun deaths in his hometown, Chicago, with the victims of violence in the gallery watching him, he demonstrated his newfound confidence by standing up to one of the most powerful lobbies in Washington, tackling an issue he himself had sidestepped earlier in his presidency.

CNN: Obama's message: 'I'm in charge'