| 1. | Sand and gravel may form bars within the channel .
沙和砾石可以在沟槽内形成沙洲。 |
| 2. | The channel is filled with noncompactible sand, or with sand and gravel .
水道内由不可压实的砂或砂砾物质充填。 |
| 3. | Sandstone and conglomerate are the consolidated equivalent of sand and gravel .
砂岩和砾岩分别是砂和砾石固结的产物。 |
| 4. | Sands and gravels for well construction - requirements and testing
水井建造用砂和砂砾.要求和检验 |
| 5. | The workers mixed the asphalt with sand and gravel together
工人们把沥青和沙子、石块混合在一起。 |
| 6. | Concrete is composed of cement ， sand and gravel mixed with water
混凝土由水泥、砂、石子与水掺和而构成。 |
| 7. | Assorted sand and gravel
筛选的砂和砾石 |
| 8. | Sand and gravel washer
砂及砾石洗涤器 |
| 9. | Sand and gravel filter
砂砾石过滤器 |
| 10. | An area covered by sand and gravel deposited at the front of a glacial moraine
冰川前砂砾层冰河冰渍前沉积的沙及砾石覆盖的区域 |
