名词
中文翻译：上游终点
同义词：
['上游端点，上游终点例句：1. The river flows steadily upstream', 'carrying sediment downstream.（河流稳定地流向上游，携带沉积物向下游流动。）']
例句：
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1. The river flows steadily upstream, carrying sediment downstream.
河流稳定地流向上游，携带沉积物向下游流动。
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2.The engineer designed the bridge to have an upstream extremity that could withstand heavy loads.
工程师设计了一座桥梁，其上游端可以承受重载。
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3.The team's progress was halted at the upstream extremity of the mountain range.
团队的进展在山脉的上游端被停止。