Veins are a passive, more limpy process because it's the bottom number of millimeters of mercury on your blood pressure, and it's the blood that is now deoxygenated.

静脉是一个被动的、更脆弱的过程，因为它是血压的最底层毫米汞柱，现在血液缺氧了。

Because the bottom number is the passive way that our blood after it is done and given the oxygen to everything, it needs to come back to the heart to get more oxygen.

因为最底层的数字是我们的血液在完成并给所有东西氧气后的被动方式，它需要回到心脏来获得更多的氧气。