名词
中文翻译：河床
同义词：
['bedrock', 'riverbed', 'floodplain']
例句：
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1.The riverbed is covered in a thick layer of silt.
河床覆盖着一层厚厚的淤泥。
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2.The geologists studied the riverbed to understand its history.
地质学家研究了河床，以了解其历史。
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3.The riverbed is prone to flooding during heavy rains.
在大雨期间，河床容易发生洪水。