Third toe第三趾thirdnum.第三；三分之一adj.第三的；三分之一的third order Lagrange equation三阶Lagrange方程third party logistics service第三方物流服务third-order intermodulation三阶互调third-generation adenovirus第三代腺病毒third dimensionless parameter第三无量纲数third party to administration行政第三人third layer switch technology三层交换机third order autonomous system三阶自治系统Third degree uterine prolapse子宫脱垂三度third-point homogeneous BVP非齐次边值问题