Nagib etal. concluded that the reduced frequency must be approximately one [15].的翻译：Nagib etal. concluded that the reduced frequency must be approximately one [15]. 什么意思？中文翻译英文，英文翻译中文，怎么说？

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Nagib etal. concluded that the reduced frequency must be approximately one [15].

the etal . Nagib concluded that reduced frequency must be approximately one [ 15 ].

Nagib etal. concluded that the reduced frequency must be approximately one [15].