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 little snail ask a mother:why are we from birth, must shoulder the hard and heavy shell? Mom:because our body without bone support, can climb up, and fast.
材料作文范文‘小蜗牛问妈妈：“为什么我们从生下来，就要背负这个又硬又重的壳呢?。
The little snail ask a mother: why are we from birth, must shoulder the hard and heavy shell? Mom: because our body without bone support, can climb up, and fast.
小蜗牛问妈妈：为什么我们从生下来，就要背负这个又硬又重的壳呢。
The little snail ask a mother: why are we from birth, must shoulder the hard and heavy shell? Mom: because our body without bone support, can climb up, and fast.
小蜗牛问妈妈：为什么我们从生下来，就要背负这个又硬又重的壳呢。
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