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这句话中over是什么意思?AthirdchallengeistradewithChina,anissueoverwhichSen.McCainandSen.Obamahavesharplydisagreed.结构是什么?which是不是引导定语从句啊?先行词是不是issue?

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这句话中over是什么意思?
A third challenge is trade with China,an issue over which Sen.McCain and Sen.Obama have sharply disagreed.
结构是什么?which是不是引导定语从句啊?先行词是不是issue?
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找到一个相似的例句
The teachers disagree over the girl; some think she cannot be blamed,others want her to be punished.
老师们对这个女孩的意见莫衷一是,有的认为她不应受责备,有的希望她受到处罚.
或许这两个例句的over用法一样