...ries，2002：4)主要关注关系从句的内部句法，他认为，关系从句中的变元即空缺和标句词C是通过关系代词或空算子(empty operator)的移位相互联系着的。
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empty operator
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以上为机器翻译结果，长、整句建议使用 人工翻译 。
Rail cars that should have been full arrived empty, and an operator error threw a network carrying 200, 000 of them into gridlock, snarling traffic along the east coast.
ECONOMIST: What kind of industry asks its regulator to block all deals?
One operator said fields usually filled with tents and caravans remained empty.
BBC: Fears over long-term flood impact on tourism
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