gravel meaning in Chinese
2.【地质学；地理学】砂石，砾。 gravel bed 砾层。
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- Sand and gravel may form bars within the channel .
- Gravel is much used for road-making .
- Gravel banks along rivers are always light or white .
- They may form concentrated pockets in gravels .
- More gravel is needed to fill the hollow in the drive .