名词
中文翻译：上游
同义词：
['upriver', 'upstream', 'upper reaches例句：1. The river flows through the city and its upstream areas are heavily polluted.（这条河流经城市，其上游地区污染严重。）']
例句：
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1. The river flows through the city and its upstream areas are heavily polluted.
这条河流经城市，其上游地区污染严重。
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2. The scientists studied the upstream effects of climate change on the ecosystem.
科学家们研究了气候变化对生态系统上游的影响。
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3. The company's headquarters are located in the upstream area of the city.
该公司总部位于城市的上游区域。