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The hemoglobin then picks up carbon dioxide, the waste product of metabolism, which it is then taken back into the lungs and breathed out in to the air. The full cycle begins all over again.第五步，我导入的是《平凡的世界》，手机端看的进度会同步到电脑端、阅读器端，平板端，真正实现多平台阅读进度同