R, D D&M:One, two, begin! Ai---Hay---Yo! Ai---Hay---Yo! Oh, the radish is too heavy. We cant pull it out.

兔，狗和猴：一，二，开始！哎---嗨---呦！哎---嗨---呦！哦，这萝卜太重了。我们拔不出来。 。

youdao

R, D&M:One, two, begin! Ai---Hay---Yo! Ai---Hay---Yo! Oh, the radish is too heavy. We can't pull it out.

兔，狗和猴：一，二，开始！哎---嗨---呦！哎---嗨---呦！哦，这萝卜太重了。我们拔不出来。

youdao

NING Ai-lin. Effect of precipitates and its distribution on mechanical properties of high-strength aluminum alloy [d]. Changsha: Central South University, 2007.

[4]宁爱林。析出相及其分布对高强铝合金力学性能的影响[d]。长沙：中南大学，2007。

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Late last year, a group of leading scientists published an editorial in the American Journal of Clinical Nutrition calling for an "urgent need" to increase the AI for vitamin D.

CNN: Vitamin D is hot! Here's how to get it

The AI for vitamin D is 200 International Units for adults under age 50, 400 IU for those 51 to 70, and 600 IU for those age 71 and above.

CNN: Vitamin D is hot! Here's how to get it

The Institute of Medicine, a group that uses scientific research to formulate public health policies, currently recommends an Adequate Intake, or AI, rather than a specific daily amount of vitamin D.

CNN: Vitamin D is hot! Here's how to get it