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-arch双联拱double patent重复授予专利double points复式道岔, 三开道岔Double eyelid重睑成形术double tracks双轨制double gloves双层手套double league双循环制double-bell双碗形double period连续两节(课)double nozzle双头喷嘴