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凹み, 窪み, くぼみ, へこみ
1. hollow, cavity, dent, depression
tbd
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凹凸, おうとつ
1. unevenness, bumpiness, roughness, ruggedness
2. imbalance, inequality, unevenness, disparity
不平整、凹凸不平、崎岖;失衡、差异