At least in Europe, milk drinking may have given people a source of calcium to aid in vitamin D production, as they moved north and sunlight, the usual source of vitamin D, decreased.
在欧洲，人们需要饮奶吸收钙元素，来帮助人体制造维生素 D。因为当他们往北迁徙时，提供维生素 D 的阳光会逐渐减少。
| 单词 | vitamin d production |
| 释义 |
vitamin d production
原声例句
双语版 TED-Ed 演讲精选 At least in Europe, milk drinking may have given people a source of calcium to aid in vitamin D production, as they moved north and sunlight, the usual source of vitamin D, decreased. 在欧洲，人们需要饮奶吸收钙元素，来帮助人体制造维生素 D。因为当他们往北迁徙时，提供维生素 D 的阳光会逐渐减少。 |
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