crust n. 1.面包皮 (opp. crumb);干面包片;生活口粮,糊口之资。 2.外皮,壳;〔美国〕雪壳;【地质学;地理学】地壳;【动物;动物学】甲壳;【医学】痂;(酒等的)浮渣;水垢。 3.(事物的)皮相,外表,表面。 4.〔美俚〕老面皮,厚颜无耻,没礼貌;(人的)脑壳。 crust movement 地壳移动。 earn one's crust 挣钱糊口。 have a crust 〔美俚〕脸皮太厚;太大胆,太鲁莽,太冒失。 the upper crust 〔古、俚〕上层社会。 vt.,vi. 用外皮覆盖;结成硬皮;生痂儿。 The snow has crusted over. 雪在地上结成冰壳。
Organic rubbers develop a resinous surface crust through weathering . 有机橡胶经过风蚀后,逐呈现出树脂状的外表。
With continuing of rainfall , the influence of soil - aggregated degree was very great . seventhly , mutual effect between soil crust and raindrop splash was studied , the result showed that splash erosion rate was greatly increased , once soil surface crust was formed 七、表土结皮形成对土壤溅蚀的影响:随着表土结皮的逐渐形成,土壤抗侵蚀能力增强,土壤溅蚀速率急剧减小。
Through rainfall simulating under laboratory , and making slice of sampling , the project researched in the soil crust development , and studied the dynamic rule of erosion factors which were raining and soil erosion factors during soil crust development . in the same time , the research was to find the critical condition of all factors in the process of soil crusting , and to filter the critical factor that could affect soil surface crust 本文采用人工模拟降雨方法,通过采样制作土壤切片,观察分析表土结皮在不同条件下发育的微形态特征,研究降雨、土壤等侵蚀产沙因子在表土结皮发育过程中的动态响应规律,界定表土结皮发育过程中各因子的临界条件,筛选有关土壤颗粒组成、结构特征等物理化学性质对表土结皮形成影响的关键因子。
( 2 ) runoff - yielding time on grassland with a higher cover ratio primarily depended on initial water content , and their relationship might be described by a power function too . surface crust could easily take place on bare land , so its runoff - yielding time primarily depended on rainfall intensity , and their relationship might be described by a linear function ( 2 )植被覆盖度较高的荒草地,产流时间主要取决于初始含水量,两者的关系可用幂函数描述;裸地因降雨产生地表结皮,产流时间主要取决于降雨强度,两者的关系可用线性描述。