It is thanks to the green plants that the air is full of free oxygen.
多亏有了绿色植物，空气中充满了游离氧。
Red blood cell: a specialized cell, full of haemoglobin, which carries oxygen in the blood.
红细胞—血液中含有血红蛋白的特殊细胞，携带氧气。
Red blood cell: a specialized cell, full of haemoglobin, which carries oxygen in the blood.
红细胞—血液中含有血红蛋白的特殊细胞，携带氧气。
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