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2.1 并列或递进结构:and, or, even
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2.2 句⼦子对应成分分析:both...and..., ...and...
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2.3 定义描述类重述:is..., call, provide, give, afford, example
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3.1 分词结构:doing, done
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3.2 从句表达:when, which, that, who...
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3.3 by 结构:by sthsb; by doing
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4.1 因果关系:because, due to, as, so that
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4.3 名词性(同位语)或其它补充成分(包括指代)
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5.1 直接转折:but, yet, however
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5.2 时间状语:now, previously, recently
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5.3 其它含有对立的词汇(包括比较) :moreless, reconcile, paradox
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5.4 否定表达:free from, no, avoid
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