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deep pool; deep water; abyss
depths (e.g. of despair); grip (e.g. of death)
川の渕で魚が泳いでいる。
Fish are swimming in the pool of the river.
深い渕には危険が伴う。
The deep pool is accompanied by danger.
渕まで泳げるか試す。
I'll try to swim to the deep pool.