... lime-sandstone石灰砂岩 lime-secreting纯钙质的 lime-shalesequence灰岩-泥岩层系 ...
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另外，为了吸收钙质维生素D是必需的。摄取足够维生素D和钙质的纯素食者应该不会有什么身体问题。
Vitamin D is also essential for bone health, so vegans who get the amount of Vitamin D and calcium recommended by the Institute of Medicine should have no issue with bone density.
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