VOA慢速英语:志愿者用3D打印技术制造新冠治疗所需瓣膜

printing – n. the process of producing writing, images or other material by using a machine

valve – n. piece of equipment used to open and close the flow of liquid or gas

mask – n. a covering for the face

prototype – n. the first model of something new that can be developed in the future

deliver – v. take goods from one place to another

luggage – n. bags and cases used by travelers

genius – n. a person who is extremely intelligent of very good at doing something

focus – v. to turn one's attention to something

shift – n. a period of work at a workplace