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what作修饰词?成分?itisnotalwayseasyforthepublictoseewhatuseanewinventioncanbeoftohumanlife的what作修饰词那ues是名词不定式see后面跟句子那主语?谓语?很少见what作修饰语

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what作修饰词?成分?
it is not always easy for the public to see what use a new invention can be of to human life的what作修饰词那ues是名词不定式see后面跟句子那主语?谓语?很少见what作修饰语
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it is not always easy /for the public/ to see ( use a new invention )can be of (what)to human life
对于大众来讲,使用新发明对人们生活的影响很容易看到.