• Many people even kept track of Lois online, through a 24-hour-a-day camera feed on the Museum's web site.

    VOA: standard.2010.07.30

  • So they kept track of country-by-country, when cases of smallpox occurred, and as it was eliminated from regions of the country, they then certified those regions to be smallpox free.

    它跟踪调查了一个又一个国家,记录天花在这个国家中何时发生,又是何时清除的,并确证这个区域已经没有天花

    耶鲁公开课 - 生物医学工程探索课程节选

  • They are kept track of very closely, but because there's still smallpox that exists on the planet, there is some concern that that could be obtained and used to develop a weapon.

    并且科学家们仔细记录病毒的使用情况,但因为这星球上仍存在天花,就会有人担心,某些人会获得天花病毒,并将其制成武器

    耶鲁公开课 - 生物医学工程探索课程节选

  • and he kept track.

    并作了记录。

    耶鲁公开课 - 公正课程节选

  • And he kept track of how many people he gave the vaccines to, and then he kept track of what would happen to those people when a smallpox infection occurred in their community.

    他与接种过牛痘的人保持联系,关注当天花在这些人周围肆虐时,他们身上发生了什么

    耶鲁公开课 - 生物医学工程探索课程节选

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