大海沟 dàhǎigōu marine trench Definitions Defs Origin Strokes Stroke Words Sentences Sents 大 dà adjective big big; large; great; vast; high in scale or intensity; (of a person) old; adult海沟 海溝 hǎigōu oceanic trench A long, narrow, and steep-sided depression in the ocean floor, typically exceeding 6,000 meters in depth.
