For vitamin D supplementation, vitamin D3 (cholecalciferol), which is the form of vitamin D naturally produced in the skin, is preferred to vitamin D2 (ergocalciferol).是什么意思_For vitamin D supplementation, vitamin D3 (cholecalciferol), which is the form of vitamin D naturally produced in the skin, is preferred to vitamin D2 (ergocalciferol).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句