一种肥沃的土壤，由沙、粘土和腐烂的有机物的混合物构成。
胡罗卜中
含有大量的人身体中所需维生素A的重要成分胡罗卜素。
4.unstratified soil deposited by a glacier; consists of sand and clay and gravel and boulders mixed together.
冰河沉淀形成的不分层的土壤，由沙、粘土、砂砾和漂石混合而成。
5.It took a lot of blood, sweat and tears to get to where we are today, but we have just begun. Today we begin in earnest the work of making sure that the world we leave our children is just a little bit better than the one we inhabit today。
我们的今天是多少血汗、泪水换来的，但路才刚刚开始。今天，我们做出诚挚的努力，确保留给孩子们的世界，比现在的再好一点点。
6.②the composition of grade are sand 44.75%,silt 31% and clay soil 24.25%;
②粒级构成:砂44.75%,粉砂31%,黏土24.25%;
8.the maximum additional force of sand soil is 1.34 and 2.25 times the clay;
砂土的最大负摩擦力分别是粘土、砂质粘土的 1.34 和 2.25 倍;
9.(2) The composition of grade is as follows: sand 44.75%, silt 31%, and clay soil 24.25%.
(2)粒级构成为：砂44.75％，粉砂31％，黏土24.25％；
