名词
中文翻译：水生杂草
同义词：
['water weed', 'aquatic weed']
例句：
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1. The river was chokedwith riverweed during the flood season.
洪水季节，河流被水草堵塞了。
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2. The farmers were trying to remove theriverweed from their fields.
农民们正试图从他们的田地中去除水草。
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3. The riverweed is a commonproblem in many rivers and lakes.
水草是许多河流和湖泊中的常见问题。