backwatern.
英 'bækwɔːtə | 美 'bækwɔtɚ
中文n. 回水；死水；停滞不进的状态或地方
词根词源
backwater (n.)late 14c., "water behind a dam," from back (adj.) + water (n.1). Hence flat water without a current near a flowing river, as in a mill race (1820); figurative use of this for any flat, dull place is from 1899.
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