Vitamin D helps bones and muscles grow strong and healthy.Low levels of vitamin D can lead to problems such as rickets, a deformity mainly found in children.是什么意思_Vitamin D helps bones and muscles grow strong and healthy.Low levels of vitamin D can lead to problems such as rickets, a deformity mainly found in children.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句