名词
中文翻译：洪水线
同义词：
['floodplain', 'floodplain line', 'floodplain boundary']
例句：
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1. The flood waterline is the linewhere the river meets the land.
洪水线是河流与陆地交汇的地方。
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2. The floodwaters were so high that theyoverflowed the floodwaterline.
洪水如此之高，以至于溢出了洪水线。
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3. Thefloodwaterline was a critical area foremergency response.
洪水线是紧急响应的关键区域。