net calcium absorptivity的用法和樣例：
例句
- Calcium may assist in the prevention and treatment of osteoporosis.
鈣可以幫助預防或者治療骨質疏鬆。 - Conclusion Osteoporosis and contracture in patients with neurogenic paralysis may be induced by stress and calcium loss.A theory of higravity was proposed.
結論神經性癱瘓患者因失應力和鈣丟失而造成骨質疏鬆和關節攣縮。
