In the last 20 or 30 years there have been a couple more specimens.

VOA: standard.2009.12.08

There are still some active smallpox virus specimens kept in the world, and there are two sources of small--two places where smallpox is stored now.

世界上仍有地方保存着,一些具有活性的天花病毒样本,有两个地方还储存着天花病毒样本

耶鲁公开课 - 生物医学工程探索课程节选

The Colorado center restores about four to five dinosaur specimens every year.

VOA: standard.2009.12.08

The museum not only has a display area open to the public, but also has an archival collection of more than one million specimens taking up three floors.

VOA: standard.2009.12.08