沙砾覆于铁质土层与砂砾层之上.Gravelly - sand over an iron - pan and gravel layer.小石头、砂砾层也可用来做隔绝层,以保持水分,降低土壤的温度.Pebbles and gravel also insulate the soil to keep surface temperatures low and preserve water.古河谷的边缘地带,往往缺失底部的河床相砂砾层.The ed...
Katydids were lamenting fall's approach.蝈蝈儿正为秋天临近而哀鸣.She could feel her soul crying out in her, lamenting desolately.她感到自己的灵魂在内心呼唤, 悲伤哀切.The girl has been lamenting over her misfortunes.那个女孩一直在为自己的不幸而悲伤....
The children leaded toward school, carrying slates and followed by their dogs.孩子们带着石板向学校走去, 小狗跟在后面.The house was silent but for the scraping of a branch on the slates.这所房子寂静无声,只听见树枝刮擦着石板瓦吱吱作响.Two inmates hurled slates at...