维D可以预防硬化症(1)
Hints：Harvardhttp://t1.g.hjfile.cn/voasp/rm/2007/01/20070105.mp3In recent years, research has suggested more health value from vitamin D than had once been thought. Vitamin D is produced naturally in the blood. Sunlight is a major source. It is also found in some foods. These include eggs, liver and some fish. Vitamin D is also found in pills. Vitamin D helps to…
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