基本解释双线,双线的同根派生 英汉例句With two straight needles,self-lubricated vertical-axis rotating hook for catching thread looops and sliding cam thread take-up,the machine can producetwo lines of lockstitch.本机采用双直针，立式自动加油旋梭勾线，滑杆挑线，构成二行双线锁式线迹。