牛津词典公布2021年度词汇：Vax(15)

The notion of vaccines have been in the English language since the late 1790s, around the time Edward Jenner found that cowpox could be used as a vaccine against the deadly smallpox virus.
疫苗的概念自1790年代末开始出现在英语中，大约在爱德华·詹纳（Edward Jenner）发现牛痘（cowpox）可以作为疫苗来对抗致命的天花病毒（smallpox virus）的时候。
notion
表示“观念；信念；理解；概念”，英文解释为“an idea, a belief or an understanding of sth ”举个：
She had only a vague notion of what might happen.
对于可能发生的事她只有一个模糊的概念。
The dictionary publisher assessed the frequency in use of the word by looking at news content from around the world.
词典出版商通过查看世界各地的新闻内容来评估该词的使用频率。
Dr Mercedes Durham, a reader in sociolinguistics at Cardiff University, said the choice of “vax” made sense because of its adaptability. “The word itself, to me it almost has a meme quality. With a meme you take the picture and add things, words, on to it. In some ways you take ‘vax’ and add ‘passport’ or ‘anti’ or ‘double’ and because it"s such a short word you can add different things on to it,” she said.