n.碎石
v.铺碎石；使困惑
The water is infiltrating the gravel bed. 水正渗透进碎石底层。
Depressions are usually caused by heavy trucks passing over the gravel. 路面下沉通常是由路过铺碎石的重型卡车引起的。
adv.严肃地；庄重地；严重地；沉重地
n.铺砾石
adj.多碎石的；铺有碎石的；发出沙哑声的
