The hard bone has dulled up the knife blade.
这硬骨头把刀刃弄钝了。
Objective To investigate the influence of surface potentials of tooth hard tissue on bone remodeling.
目的研究牙体硬组织表面电位与骨生长改建的关系。
Wolf mistakenly swallow a piece of bone, very hard, running around, Looking for a doctor.
狼误吞下了一块骨头，十分难受，四处奔走，寻访医生。
The Wolf tries hard to take out the bone, but nothing works.
狼：这骨头咽不下去，也吐不出来，我没办法了，得找人帮忙。
The Wolf tries hard to take out the bone, but nothing works.
狼：这骨头咽不下去，也吐不出来，我没办法了，得找人帮忙。
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