为了缓解O型血-通用血型的紧张状况，科学家们开始研究是否可以把其它的血型的血转换成为0型血
Scientists may have found a way to reduce shortages of type O blood. Type O is the kind of blood that hospitals most often need. What the researchers are testing is an easier way to make type O blood out of other kinds of blood. There are 4 main blood types. Most people are born with one of these f…