low head短语⁶³⁹⁵⁴ 基本例句 低落差 Domestic magnesium- silicon jade total hip prosthesis has too low head- neck ratio to result in enough range of motion that fulfilled daily living after total hip arthroplasty. 国产镁硅玉全髋假体由于头颈比太小，在任何安置方位内其活动范围都较小，将难于满足日常生活需要。 http://dj.iciba.com