多重定语从句

It can loosely be described as travel that takes place at regular intervals-often in an annual cycle-that may involve many members of a species, and is rewarded only after a long journey.
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1 个回答

这是一个双重定语从句。第一个that从句的先行词为travel,第二个that从句的先行词为travel that takes place at regular intervals。二个破折号相当于二个逗号,中间的often in an annual cycle为插入语,是作者对at regular intervals的解释、说明。
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