他与外界隔绝了，唯一的信息渠道是电话。
He is ______ ______ ______ the outside world and his only channel of information is the telephone.
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他与外界隔绝了，唯一的信息渠道是电话。
He is ______ ______ ______ the outside world and his only channel of information is the telephone.
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