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理解一句英语Because the Great Depression's effect on industry actu

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理解一句英语
Because the Great Depression's effect on industry actually helped clean up the air.
我理解其意思：大萧条对工业造成的影响实际上帮助了“净化空气”（工厂大规模倒闭了污染就少了）.
但我不明白clean为何不是cleaned,我在听写时很自然就写出了cleaned,但原句没有.怎么理解这里?可以说语法,但从语境方面讲更好.我觉得写clean而不是cleaned的原因可能是：这里重在“说其作用”而不是“陈述事实”——此时用原型就可以理解了,但我又想,就算是cleaned来陈述似乎也没有问题?但在词典搜不到helped cleaned up的例句,让我很迷惑.通俗简要地解释即可,
理解一句英语Because the Great Depression's effect on industry actu
因为是 help (somebody) (to) do something
所以用原型.习惯用法.
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