The brain requires a constant supply of oxygen.
大脑需要持续的供氧。
Red cell mass, and thus oxygen-carrying capacity, remains constant over time in the healthy animal.
红细胞的数量和携带氧气的能力，在健康动物中时刻保持恒定。
Red cell mass, and thus oxygen-carrying capacity, remains constant over time in the healthy animal.
红细胞的数量和携带氧气的能力，在健康动物中时刻保持恒定。
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