“石砾”怎么读

“石砾”的英语可以翻译为：chad ...

常常在排水瓦管周围铺一层粗石砾.A layer of coarse gravel is often placed around the drain tile.颗粒大于2毫米的划归石砾.Particles larger than two millimeters are classed as gravel.随后,他听到她的脚步声离开他, 超过废石砾,渐渐远去.Then he heard her footsteps go away from ...