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凹凸不平
āotūbùpíng
1. to be bumpy
2. uneven

Character Breakdown

凹
āo
concave, hollow; depressed; pass, valley
HSK 6 5 丶
凸
tū
to protrude, to bulge out; convex
HSK 6 5 丶
不
bù
no, not, un-; negative prefix
HSK 1 4 丶
平
píng
flat, level, even; peaceful
HSK 3 5 丶

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Chinese