名词短语
中文翻译：逐渐变化的水流同义词
同义词：
['1. gradually changing flow']
例句：
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1. The river slowly widened as it flowed further downstream.
随着河流继续向下游流动，它慢慢地变宽了。
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2. The stream had undergone a significant transformation over the years.
这条小溪多年来经历了重大的变化。
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3. The water gradually varied in its composition as it moved through different regions.
随着水流经过不同地区，其成分逐渐发生变化。