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1·It is recommended that protein intake should not exceed twice the RNI.

这是建议，蛋白质摄入量不应超过推荐摄入量的两倍。

2·The RNI is the amount of nutrient which is enough for at least 97% of the population.

在推荐摄入量的金额养分是不够的，至少97 ％的人口。