Double T四环素[四环素类抗生素]doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double threat双重威胁double-voidn.双空位；空位对double-buds双株芽接苗double puzzle双面猜谜double muscle双肌肉double hybrid双交杂种double vagina双阴道double cancer二重癌double output双输出double-rate双率计