血棕色素

例句：

1. 1. The red blood cells are responsible for carrying oxygen to the body's tissues.
   红细胞负责将氧气输送到身体组织。
2. 2. Blood pigment is essential for the human eye to see in low light conditions.
   血液色素对于人类在低光条件下看到东西至关重要。
3. 3. Hemoglobin plays a crucial role in transporting oxygen from the lungs to the rest of the body.
   血红蛋白在从肺部运输氧气到身体其他部位的过程中起着关键作用。