常見例句Doctors used to let blood when people got fever.過去，當(dāng)人發(fā)燒時醫(yī)生就給他們放血。It seems keener on blood transfusions than on bloodletting.相比于給經(jīng)濟(jì)放血，它看起來更熱衷于給它輸血。 返回 blood letting