Let us again imagine an idealized experiment. A small sphere with an electric charge is forced, by some external influence, to oscillate rapidly and in a rhythmical way, like a pendulum.

我们再来设想一个理想实验，用某种外部影响迫使一个带有电荷的小圆球很快而且有韵律地像钟摆一样振荡起来。

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In essence, language results from the interaction of both the internal biological foundation and the external influence of language.

语言本质上是内在的生物基础与外在的语言影响相互作用的结果。

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When has your life dramatically changed as the result of some seemingly random external influence? How much do you feel in control of the course of your life?

什么时候你的生活因为外来因素而发生过重大改变？如果可以掌握生命的历程，你感觉如何？

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Zbigniew Lewicki, a specialist in American studies at the University of Warsaw, told the Polish Radio External Service that there is also concern about Russia's perceived attempts to increase its influence in former Soviet satellite states, including Poland.

VOA: standard.2009.09.17

However a senior official added that judges should not be subjected to improper external influence.

BBC: Perception and reality

But the Lord Chief Justice's principal private secretary Laurene McAlpine has said courts must act without external influence.

BBC: David Ford 'will not interfere' in court cases

The trouble with a diagnosis based on conviction rather than measurement is that it is vulnerable to external influence.

ECONOMIST: Diagnosing comas