Experts contend, however, that the transformation of a deadly virus or bacterium into an effective weapon is anything but straightforward: A conventional bomb would likely destroy the germ as it exploded. In contrast, dissemination via alternative methods, such as surface mail, has recently proved quite effective. 然而，专家认为，要将一种致命的细菌或病毒转化成有效的武器并不是一件容易的事：一颗常规炸弹就有可能在爆炸时摧毁病菌。相对来说，通过其它方式传播，如普通邮件，近来被证实相当有效。 编辑推荐：2009年下半年公共英语考试报名汇总 名师指导公共英语阅读考试技巧 公共英语pets三级全真模拟试卷 公共英语pets二级语法讲解汇总