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大海沟
大海溝
dàhǎigōu
1. marine trench

Character Breakdown

大
dà
big, great, vast, high, deep
HSK 1 3 丶
海
hǎi
sea, ocean; maritime
HSK 4 10 丶
沟
gōu
ditch, drain, gutter, narrow waterway
HSK 5 7 丶

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