The calcium was included in the study because researchers initially set out to investigate the link between calcium, vitamin D and bone health.

研究中之所以包括钙是因为研究人员最初是调查钙、维生素D与骨健康间的联系。

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Vitamin D, or calciferol, is another fat-soluble steroid vitamin that functions to stimulate calcium uptake from the gut and its deposition in bone.

维生素 D，或钙醇，是另一种脂溶性类固醇维生素，其功能是促进肠道吸收钙并强化骨骼。

youdao

Vitamin D, or calciferol, is another fat soluble steroid vitamin which functions to stimulate calcium uptake from the gut and its deposition in bone.

维生素 D，或钙醇，是另一种脂溶性类固醇维生素，其功能是促进钙从肠道吸收并沉积在骨头中。

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Vitamin D prevents the children's bone disease rickets.

VOA: special.2009.04.21

Vitamin D is essential for bone and muscle health in both adults and children.

CNN: How much vitamin D do I need?

Cliff Rosen, past president of the American Society for Bone and Mineral Research, agreed that there isn't much data showing calcium-and-vitamin-D supplements can prevent bone fractures.

WSJ: Vitamin D and Calcium Supplements May Not Stop Fractures

And of course vitamin D is key to building bone health and preventing osteoporosis.

FORBES: That Vitamin D You're Taking? It May Not Be What It Appears