hemofuscin

例句：

1. 1. The red blood cellsare responsible for carrying oxygen throughout the body.
   红细胞负责将氧气输送到全身。
2. 2. Hemoglobin is a protein that bindsto oxygen and transports it to tissues.
   血红蛋白是一种蛋白质，它与氧气结合并运输到组织中。
3. 3. Hemoglobin levels can varydepending on factors such as age, gender, and altitude.
   血红蛋白水平可以根据年龄、性别和海拔等因素而变化。