名词
中文翻译：Unknown
同义词：
['sediment', 'sedimentary', 'deposited']
例句：
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1. The alluvial fans are a fascinating landscape to explore.
冲积扇是一处令人着迷的景观，值得探索。
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2. The river has been depositing sediment for thousands of years.
这条河已经沉积了数千年的泥沙。
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3. The alluvium is a geological formation formed by the deposition of sediment.
冲积层是由沉积物形成的地质构造。