正文

VOA慢速英语:日本开始接种新冠疫苗

2021-02-18来源:和谐英语

Update Required To play the media you will need to either update your browser to a recent version or update your Flash plugin.

Words in This Story

clinical trial - n. a test to determine the effectiveness of a new drug or medical technique

pandemic - n. an occurrence in which a disease spreads very quickly and affects a large number of people over a wide area or throughout the world

positive - adj. showing the presence of a particular germ, condition, or substance

dose - n. the amount of a medicine, drug, or vitamin that is taken at one time