至于人们谈到的隧道，他说，是眼部血液流动缺乏所致。

And the tunnel people speak of, he says, is lack of blood flow to the eye.

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至于红斑痤疮，主要则是维生素B缺乏所致。

With rosacea, a lack of B vitamins may play a role.

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同时还批准该药物作为NAGS缺乏所致慢性高氨血症的维持治疗药物。

The drug is also approved for use as maintenance therapy for chronic hyperammonemia that results from NAGS deficiency.

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