VOA慢速英语:以色列的研究人员创造了第一个3D打印心脏

three-dimensional – adj. having or seeming to have length, width, depth

breakthrough – n. an important discovery or development

vessel – n. small tube that carries blood through the body

transplant – v. operation in which a new organ is put into someone's body

patch – n. piece of material use to repair damaged parts of something

challenge – n. a difficult task or problem

routinely – adv. regularly or often

complication – n. a new medical problem that develops when someone is being treated for an illness

regulation – n. an official rule that controls how something is done

protocol – n. rules about what you must do and how you must behave in official situations