" It'll be faster." They slogged toward the rocks, sand gripping their feet.

“会更快的。”他们艰难地朝岩石走去，脚上沾满了沙子。

Concrete is a mixture of rocks, sand, water and most importantly, cement to bind it altogether. But cement has a huge carbon footprint.

混凝土是岩石，沙子，水的混合物，最重要的是，水泥将其完全混在一起。 但是水泥中很有大量的碳。

Close to the back of the house stood a sand rock, in which I made a cave, and laid all the earth that I had dug out of it round my house, to the height of a foot and a half.

房子后面有一块沙石，我在里面挖了个洞，然后我把从沙石里面挖出的土铺在我房子周围，高达一尺半。