[ 复数 ungulae ]
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N a truncated cone, cylinder, etc 蹄状物 [maths]
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Ungula and ring fracture are due to higher surface hardness. The rational suggestions to settle fracture are put forward.
爪形和环形断裂由表面硬度偏高造成,并提出解决断裂问题的合理化建议。
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