名词
中文翻译：流动不稳定
同义词：
['flow instability', 'unsteady flow', 'unstable flow']
例句：
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1. The river flows through the valley with a constant instability.
这条河流在山谷中流动，总是不稳定的。
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2. The unsteady flow of the river caused the bridge to sag.
河流的不稳定流动导致桥梁下陷。
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3.The unstable flow of the water was causing problems downstream.
水流的不稳定流动导致了下游的问题。