立彬の日本語
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流域， りゅういき
1. drainage basin, catchment basin, river basin, watershed, valley
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激しい雨がその流域に洪水をもたらした。
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The heavy rain brought floods in the valley.
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ダムが切れて流域に大水が押し寄せた。
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The dam gave way and sent a great flush of water down the valley.
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