世界上只有美国和前苏联曾经花大力气研究生物武器。
The only ultimate concerns were biological warfare aspects of this, but gave us the go ahead to start these experiments for the reasons we were doing them.唯一根本性的担忧是在生物武器方面,不过,只有开始进行这些实验之后,我们才能找出从事这一切真正是为了什么。
These examples demonstrate that recent treaties banning chemical and biological warfare find a deeper resonance in human history, psychology, and morality.这些例子说明最近我们关于禁止化学和生物武器的公约在人类的历史、心理和道德上有着深厚的渊薮。