Those that link to the pulmonary arteries carry deoxygenated blood that needs to be refreshed.
那些连接着没有氧气的肺动脉中的血液需要更新。
The increased pressure increases the resistance to blood flowing down the jugular veins, and insufficient valves may allow deoxygenated blood to push back up the neck.
（这不就是“挣挣挣。屎”么。。。）急速上升的压力增加了颈动脉血液回流的阻力，并且没有完全闭合的膜瓣使得木有氧气的静脉血返回了脖子。
The right atrium receives deoxygenated blood from vena cava.
右心房接受从大静脉来的缺氧血液。
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