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What does it mean when you are in the third stage of iron deficiency?

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What should people do if they don't know whether they have an iron deficiency or not?

What are good sources of iron?

中华民族历来尊重人的尊严（dignity）和价值。还在遥远的古代，我们的先人就已提出“民为贵”的思想，认为“天生万物，为人为贵”。一切社会的发展和进步，都取决于人的发展和进步，取决于人的尊严的维护和价值的发挥。今天中国所焕发出来的巨大活力，是中国人民拥有广泛自由、民主（democratic rights）的生动写照。中国在公元1世纪人口就已达到6000万，众多人口的衣食住行，几千年来一直是中国政府所要解决的首要人权问题。

Listen to a speaker talking about his trouble in exercise and the suggestions given by two exercise experts. Answer the following questions according to what you hear. The last question is open-ended.[音频]1. What is the speaker's problem with exercise?