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美国专利US6950635 (2005年9月27日授权) 当一位摩托车乘客戴上头盔时,其听力就会受到一 定程度的影响。于是,有人便提出了在车体与头盔之间
U.S. Patent No. 6,950,635 (issued September 27, 2005) When a motorcycle passenger wears a helmet, its hearing can be somewhat affected. So, someone put forward in the body and helmet between