down grade下坡
dthisgerous down grade下坡危险
long heavy down grade长大下坡道
Retarded Down Grade Lane减速下坡车道
precarious down grade下坡危险
on the down grade在走下坡路;翻译
down grade separation下立交
dangerous down grade下坡危险;下坡伤害;下坡危机;荫
steep down grade陡下坡