名词
中文翻译：分级的河流
同义词：
['graded river', 'graded watercourse', 'graded stream']
例句：
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1.The graded stream is a popular destination for anglers and hikers alike.
这条分级河流是钓鱼者和徒步旅行者都非常喜欢的地方。
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2. The graded stream has been designated as a protected area due to its ecological importance.
这条分级河流因其生态重要性而被指定为保护区。
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3. The graded stream provides habitat for a variety of aquatic species, including fish and frogs.
这条分级河流为各种水生物种提供了栖息地，包括鱼类和青蛙。