As I just stated, oxygen-rich blood contains 20 ml of oxygen in every 100 ml of total blood volume.

正如我刚才所说，富含氧气的血液中每100 ml总血液中含有20 ml氧气。

The plasma volume has a direct effect on the total blood volume, which has a direct effect on your blood pressure.

血浆量对总血容量有直接影响，而总血容量对血压有直接影响。

Down at the bottom you've got a heavy red layer of erythrocytes, or red blood cells that carry oxygen and carbon dioxide. They make up about 45 percent of your total blood volume.

在底部有一层厚厚的红细胞，也就是携带氧气和二氧化碳的红细胞。它们约占你总血容量的 45%。