基本解释地下排水沟，鼠道式排水沟英英字典柯林斯英英字典 an underground cylindrical drainage channel cut by a special plough to drain heavy agricultural soil mole drain剑桥字典mole drain柯林斯字典专业释义土木建筑工程鼠道式排水沟地下排水沟机械工程地下排水沟