Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes form a random pattern.
哺乳动物将营养物质输送到骨细胞的微小管道是平行排列的，而鸟类的管道则是随机排列的。
Objective Study the mechanism of the healing of bone defect after transplantation of the tissue-engineered cartilage into the bone defects and with guided bone regeneration tubes.
目的通过引导性骨再生和组织工程软骨移植研究长骨骨缺损的修复机制。
Should osteoporosis get severe enough to collapse a vertebra, doctors have a new way to make repairs: Two tiny balloons are inserted into the bone through surgical tubes.
如果骨质疏松症严重到有损脊椎骨，医生们有新的办法来修复：通过手术管道，两个很小的气球被植入骨头。 气球膨胀将骨头推向正常的位置，然后骨头接合剂防止脊椎骨再次损伤。
Should osteoporosis get severe enough to collapse a vertebra, doctors have a new way to make repairs: Two tiny balloons are inserted into the bone through surgical tubes.
如果骨质疏松症严重到有损脊椎骨，医生们有新的办法来修复：通过手术管道，两个很小的气球被植入骨头。 气球膨胀将骨头推向正常的位置，然后骨头接合剂防止脊椎骨再次损伤。
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