like or caused by a virus 病毒的；病毒性的；病毒引起的 a viral infection 病毒性感染
used to describe a piece of information, a video, an image, etc. that is sent rapidly over the internet and seen by large numbers of people within a short time （信息、视频、图像等）在网上快速传播的 a viral email 快速传播的电子邮件 Within 24 hours, the video went viral on YouTube and Facebook. 在 24 小时内，该视频在影片分享网站和脸书上疯传。