Bǔchōng gài hé wéishēngsù D néng yùfáng gǔzhìshūsōng.
Taking calcium and vitamin D can prevent osteoporosis.
Tips
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Read it literally: 'bone-substance + loose-slack'. 疏松 on its own describes loose, porous soil — perfect image for the honeycombed bone tissue of osteoporosis. The full form 骨质疏松症 adds 症 for 'disease/syndrome'.