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英语翻译We usually think of pollution as a harmful waste substan

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英语翻译
We usually think of pollution as a harmful waste substance that threatens the air and water.But some people have become concerned about another kind of pollution.It can be everywhere,depending on the time of day.And it was not thought of as a substance.It is light.
只需翻译倒数第二句“And it was not thought of as a substance.”
顺便问一下:form有没有被动语态?
它不是一种物质
form没有被动语态