Ungula and ring fracture are due to higher surface hardness.The rational suggestions to settle fracture are put forward.
形和环形断裂由
面硬度偏高造成,并提出解决断裂问题的合理化
议。
；
（ungula的复数）Ungula and ring fracture are due to higher surface hardness.The rational suggestions to settle fracture are put forward.
形和环形断裂由面硬度偏高造成,并提出解决断裂问题的合理化议。
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