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 |
例句 |
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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