Many Rwandans have never found the remains of family who were killed at that time.

VOA: standard.2009.04.10

There's no question that there was a Greek colony there and as I say the archaeological remains confirm the general time for this happening.

这是确凿无误的,但是,正如我所说,考古学上仍有某些有待解决的问题

耶鲁公开课 - 古希腊历史简介课程节选

So, the concern at this time, and still remains a concern, is that infectious agents, particularly very deadly infectious agents like smallpox, could be weaponized in some way, or converted into a weapon.

当时有一些担心,现在还在担心,这些传染源,尤其是像天花非常具有致命性的传染源,可以进行某种程度的武器化,或者转变成武器

耶鲁公开课 - 生物医学工程探索课程节选