dowel

n wooden or metal pin with no head for holding two pieces of wood, metal, stone, etc together 暗榫; 暗钉; 合缝钉.

doubtfully, doubting Thomas, doubtless, douche, dough, doughnut, doughty, doughy, dour, dourly, douse, douse (also dowse), dove, dovecote, Dover, dovetail, dowager, dowdily, dowdiness, dowdy, down, down draught (US down draft), down with, Down's syndrome, down-and-out, down-hearted, down-market, down-to-earth, downbeat, downcast, downer, downfall, downgrade, downhill, Downing Street, download, downplay, downpour, downright, downs,