The wind booms down the curved length of the trailer and under its roaring passage he can hear the scratching of fine gravel and sand.
风沿着拖车的轮廓呼啸着打转，他都能听到沙砾在风中发出刮擦声。
Minimize the amount of water your toilet uses with each flush by putting a plastic bottle (a large pop bottle will do fine) filled with sand or gravel in the toilet tank.
想减少冲马桶时的用水量，你可以把一个装满沙子或小石子的塑料瓶（汽水瓶也可以），放在水箱里。
A coarse sieve used for sifting out fine particles, as of sand, gravel, or coal.
筛子：一种粗筛，用于筛选优良的东西，比如沙子、碎石或者煤。
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