So the task is to try to figure out how to determine whether or not you could get an organism like this to evolve towards mildness by blocking waterborne transmission, thereby allowing the organism only to be transmitted by person-to-person contact, or person-food-person contact -- both of which would really require that people be mobile and fairly healthy for transmission.
所以，我们的任务是试着发现 如何来确定我们是否能通过阻止水媒传播 使得这样的病菌朝着更温和的方向进化。 也就是只允许病菌通过 人与人之间的接触传播， 或者人-食物-人的接触传播。 这两种方式实际上都需要人们 能移动和有适当的健康来进行传播。