首先，标记定义了可组合在一起形成一个查询的子句数量的上限。

First, the tag defines the upper limit on the number of clauses that may be combined to form a query.

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这颗重量级恒星颠覆了天文学家的恒星形成理论，他们认为恒星的质量存在一个最大上限。

This heavyweight is challenging astronomers' theories of star formation, smashing through the upper limit they thought existed on star mass.

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