求翻译：他提出的“关键期假说”在二语习得的研究中最有影响力的。是什么意思？

He proposed the "critical period hypothesis," Research in Second Language Acquisition of the most influential.

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He proposes “the critical period hypothesis” in the research which two language customs result in most influential.

He proposed the "critical period hypothesis" in the most influential in the study of second language acquisition.

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