The question of who actually left the South has never been rigorously investigated.

究竟是谁真正离开了南方，这个问题从未得到过严格的调查。

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This relation, however, has not been rigorously studied.

但是它们之间的关系并没有被研究清楚。

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But the theory has never been rigorously examined, say the researchers.

但该推测一直没有得到严格的调查研究，研究人员说道。

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But the theory has never been rigorously examined, say the researchers.

但该推测一直没有得到严格的调查研究，研究人员说道。

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