骨质象牙化：骨头退化成坚硬的象牙质。
Eburnation: degeneration of bone into a hard ivorylike mass.
随着人口的老龄化，骨质疏松症患病率迅速增加，给世界各国带来沉重的经济负担。
With aging of the population in worldwide, the prevalence of osteoporosis increases rapidly and it will be a huge financial burden to all the countries.
严重的维生素D缺乏会导致肌肉无力，骨质矿化缺陷以及佝偻病。
Severe deficits in vitamin D may lead to muscle weakness, defective bone mineralization and rickets.
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