单词	grounddove
释义	同Ground-dove
随便看	double-u double-u but joint double u butt joint double u groove double-u groove double u groove weld double-u groove weld double u-leather packing double umpire double undirect addressing double unequal angle cutter double uniform channel double uninersal joint double unit double-unit alternator double-unit motor double universal joint double up double up and secure double up with laughter double up with pain double ureter double uterus double vacancy double vacancy (atomic shell)