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The hemoglobin then picks up carbon dioxide, the waste product of metabolism, which it can be then taken back again to the lungs and breathed out in to the air. The full cycle begins all over again.平时有看书习惯，但不知道看啥书的人，可以来这个网站闲逛，书籍首页有很多经典类书籍推荐，缺点是有广告，