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| down cutting; vertical erosion; entrench; sapping | |||
| entrenchment; incise | |||
| undercutting | |||
| basal sapping; downcut; downcutting (作用) | |||
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| deepening | |||
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| sapping | |||
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| incision | |||
| 下 切: 225 phrases in 40 subjects |
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