名词
中文翻译：上水位
同义词：
['upper level', 'upper boundary']
例句：
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1.The river flows through a narrow valley with an upper water level of 20 meters above sea level.
这条河流流经一个狭窄的山谷，上水位为海平面以上20米。
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2. During the flood season, the upper water level rises significantly due to heavy rainfall.
在洪水季节，由于大雨，上水位显著上升。
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3. The engineer monitored the upper water level during construction to ensure stability.
工程师在施工期间监测上水位以确保稳定性。