hemoglobin

例句：

1. 1. Hemoglobin levels are critical for the oxygen transport in the body.
   血红蛋白水平对体内氧气运输至关重要。
2. 2. The study found that hemoglobin levels were significantly lower in patients with diabetes.
   研究发现，糖尿病患者的血红蛋白水平显著降低。
3. 3. Hemoglobin is a protein that carries oxygen in red blood cells.
   血红蛋白是一种在红细胞中携带氧气的蛋白质。