He wiped away the blood with a paper napkin.他用纸巾将血迹擦去。I'm a blood donor; I can't risk any contagion.我是献血者，我不能冒任何接触传染的危险。The victim suffered a dreadful injury and lost a lot of blood.受害者受了重伤，大量失血。...
Exercise dilates blood vessels on the surface of the brain.运动会使大脑表层的血管扩张。Standard measurements of blood pressure are an important but crude way of assessing the risk of heart disease or strokes...标准的血压测量是评估患心脏病或中风几率的一个重要...