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- A vitamin precursor that the body converts to its active form through normal metabolic processes.Carotene,for example,is a provitamin of vitamin A. 维生素原一种由身体通过正常新陈代谢过程，将其转化成活跃形式的维生素的前体，比如，胡萝卜素是维生素A的维生素原
- A vitamin precursor that the body converts to its active form through normal metabolic processes. Carotene, for example, is a provitamin of vitamin A. 维生素原一种由身体通过正常新陈代谢过程，将其转化成活跃形式的维生素的前体，比如，胡萝卜素是维生素A的维生素原
- a vitamin precursor that the body converts to its active form through normal metabolic processes. Carotene,for example,is a provitamin of vitamin A 维生素原一种由身体通过正常新陈代谢过程，将其转化成活跃形式的维生素的前体，比如，胡萝卜素是维生素A的维生素原
- She supplements her diet with vitamin tablets. 她服用维生素片剂以补充规定食谱中的营养。
- The precursor of the modern car was a horseless carriage with a petrol engine. 现代汽车的前身是不用马拉的，装有汽油发动机的车子。
- The vitamin is fortified with iron. 这种维他命加了铁。
- vitamin precursor 维生素原
- Bella bought a bottle of fat-soluble vitamin A. 贝拉买了一瓶可溶于油脂的维他命A
- Thefirst telephone was the precursor of modern communications networks. 最早出现的电话是现代通讯网的雏型。
- His mother told him to have a vitamin pill before leaving. 他妈妈让他在走之前吃一颗维生素药丸。
- The precursor or stem cell of a plasma cell. 成浆细胞浆细胞的前体细胞或干细胞
- A precursor cell of a melanocyte or melanophore. 成黑素细胞产生黑素细胞的母体细胞
- Error is often the precursor of what is correct. 错误常常是正确的先导。
- Some vitamin B and C will build up your resistance. 吃些维他命B和C能增强你的抵抗力。
- The precursor or stem cell of a plasmacell. 成浆细胞浆细胞的前体细胞或干细胞。
- An originator of a line of descent;a precursor. 前辈家族血脉的开始者；先驱
- Vitamin C is destroyed when overheated. 维生素C受热过度就会被破坏。
- An originator of a line of descent; a precursor. 前辈家族血脉的开始者;先驱。
- A severe cold may be the precursor of pneumonia. 重伤风可能是急性肺炎的先兆。
- Vitamin pills make up what we lack in our diet. 维生素片可以弥补我们饮食中的不足。
