名词
中文翻译：山谷砾石
同义词：
['valley rock', 'valley sandstone', 'valley limestone']
例句：
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1. The hikers had to cross the valley gravel to reach the other side of the mountain.
徒步旅行者不得不穿过山谷砾石才能到达山的另一侧。
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2. The river flows through the valley gravel, creating a beautiful landscape.
这条河流流经山谷砾石，创造了一个美丽的景观。
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3. The valley gravel was used as a base for building the new bridge.
山谷砾石被用作建造新桥的基础。