double-jointed

adj [usu pred 通常作表语] having very flexible joints that allow the fingers, arms or legs to bend backwards as well as forwards （手指、 臂或腿）有双关节（可前後活动）.

double standard, double take, double time, double transitive verb, double up, double-barrelled, double-bass, double-book, double-booking, double-breasted, double-check, double-cross, double-dealer, double-dealing, double-decker, double-dyed, double-edged, double-faced, double-glaze, double-glazing, double-park, double-quick, double-stop, double-talk, double-think, doublet, doubly, doubt, doubter, doubtful, doubtfully, doubting Thomas, doubtless, douche, dough, doughnut, doughty, doughy, dour, dourly,