double X双X(染色体)doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double whammy祸不单行double-cage双笼double dipole双偶极子double series二重级数double double两张双人床的双人间double tenons双凸榫,双榫double thread双头螺纹,双线螺纹double stacks双叠层double sizing双重上胶double switch双刀开关,两路开关