| 51. | Sand is easily pervious to water,. |
| 沙易渗水。
|
| 52. | Sand sifted into my shoes. |
| 沙漏入我的鞋中。
|
| 53. | We need 3 yards of sand . |
| 我们需要3立方码沙子。
|
| 54. | children running barefoot in the sand |
| 光着脚在沙地上跑的孩子们
|
| 55. | a bed of clay, limestone, sand , etc |
| 一层黏土， 石灰石， 沙子等
|
| 56. | children playing around on the sand |
| 在沙地上各处玩耍的孩子们
|
| 57. | get an eyeful of sand |
| 眼里刮进沙子
|
| 58. | a load of sand |
| 运载的一批沙子
|
| 59. | the imprint of a foot in the sand |
| 沙滩上的足迹
|
| 60. | numberless stars, bacteria, grains of sand |
| 无数的星星, 细菌, 沙粒
|