They may cause pulses to quicken but usually they are greeted with nervous laughter and calm evacuations.

VOA: standard.2009.09.07

Usually it involves pieces of the infectious agent itself, to cause that engagement.

通常疫苗自身也包含部分传染性介质,以便达成匹配

耶鲁公开课 - 生物医学工程探索课程节选

Usually it involves pieces of the infectious agent itself, to cause that engagement.

通常疫苗自身也包含部分传染性介质,以便达成匹配

耶鲁公开课 - 生物医学工程探索课程节选