直到目前，人类在次声频段的听力阈值仍没有得到一致的结果。本文综述了这方面的工作，并略详细地介绍了几个有代表性的工作。
In this paper some typical works are introduced in detail to make a review about the human hearing threshold of infrasonic frequencies in which an identical result has not been got up to now.
观察术前骨气导阈值，听骨链改变，手术前后纯音听力改变。
Observation measures were bone conduction thresholds, changes of ossicular chain, preoperative and postoperative changes of pure-tone hearing.
用美国OB822型电测听检测仪测定患者的骨气导阈值，记录出听力图。
Bone conduction thresholds of the patients were detected by OB822 audiometer made in America to record their audiogram.
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