Jisho

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Noun
1. oceanic trench; deep-sea trench; deep
Wikipedia definition
2. Oceanic trenchThe oceanic trenches are hemispheric-scale long but narrow topographic depressions of the sea floor. They are also the deepest parts of the ocean floor. Trenches define one of the most important natural boundaries on the Earth’s solid surface: the one between two lithospheric plates.
Read “Oceanic trench” on English Wikipedia
Read “海溝” on Japanese Wikipedia
Read “Oceanic trench” on DBpedia

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