a trench that is dug and roofed over as a shelter for troops 掩体,地下掩蔽部 ■an underground air-raid or nuclear shelter 防空洞 ■a low shelter at the side of a sports field, with seating from which a team's coaches and players not taking part can watch the game (运动场边的)球员席
(亦作 dugout canoe)a canoe made from a hollowed tree trunk 独木舟