today there are already robots working in factories 为什么用working

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todaytherearealreadyrobotsworkinginfactories为什么用workingtodaytherearealreadyrobotsworkinginfactories为

today there are already robots working in factories 为什么用working
today there are already robots working in factories 为什么用working

today there are already robots working in factories 为什么用working
working in factories 是现在分词短语做后置定语修饰robots
因为和robots是主动关系,所以用现在分词