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研究所制定
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1.
In
1997
,
the
United States
Institute
of
Medicine
established
levels
for how much
Vitamin
D
healthy
people
need
.
1997年
,
美国
医学
研究
所
制定
了
一个
健康
人
每天
所
需
的
维生素
D
摄入
量
。
yī jiǔ jiǔ qī nián
,
měi guó
yī xué
yán jiū suǒ zhì dìng
le
yī gè
jiàn kāng
rén
měi tiān
suǒ
xū
de
wéi shēng sù
D
shè rù
liàng
。
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