To complicate matters further, everybody's vitamin requirements vary.

更麻烦的是，每个人对维生素的需求量是不同的。

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This can induce chronic stress reactions in livestock, subsequently affecting vitamin requirements and in-feed concentrations.

这个作用能诱发家畜的慢性应激反应，随后影响维生素需求和饲料摄入浓度。

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Specific vitamin requirements vary widely and are influenced by the fact that many vitamins have positive or negative interactions amongst them.

单一的维生素需求有很大的不同，受维生素之间积极和消极相互作用影响。

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Some independent researchers have suggested that an adult would have to eat nine kilos of the rice every day to meet Vitamin A requirements.

ECONOMIST: Food safety