F.A.S.T. scan revealed blood pooling behind his liver.

创伤超声重点扫描显示肝后积血。

Regardless of the mechanism, once a bridging vein is torn, the blood pools in the subdural space and creates a hematoma.

无论何种机制，一旦桥静脉破裂，血液就会积聚在硬膜下隙形成血肿。

Changes like getting older or gaining extra weight can make blood pool up and form lumpy varicose veins.

变老或体重增加等变化会使血液积聚并形成块状静脉曲张。

Under Earth gravity, blood pools in our lower body, but in space, that fluid gets more evenly distributed, giving astronauts puffy faces, runny noses, and stuffy heads.

在地球引力作用下， 血液会聚集在我们的下半身，但在太空中， 血液会分布得更均匀，这让宇航员的脸浮肿、流鼻涕、头胀。