我叫维生素D。是一名脂溶性维生素。我的任务就是运送钙离子。每天清晨,我把钙离子从滚滚而下的食物中,废弃的尿液中迎接到我的汽车上,并负责驾车,送它到血液里。我常常是来不及休息,又整装出发,送它回到骨骼老家。我的力量小,能力又有限,面对繁重的运输任务,又不得不争分夺秒,加班加点。这样长时间的工作,使我的体力逐渐衰退,有的部分损坏不能发挥作用。可又没有新的成员补充,使我运 My name is vitamin D. Is a fat-soluble vitamin. My mission is to transport calcium ions. Every morning, I took calcium ions from the billowing food, abandoned urine to my car, and was responsible for driving and sending it to the bloodstream. I often have no time to rest, and the whole set out, send it back to the skeleton home. My strength is small and my ability is limited. In the face of heavy transport tasks, I have to compete against each other and work overtime. Such a long period of work, so that my physical decline gradually, some of the damage can not play a role. But no new members to add, so I am shipped