Moreover, "says Chin Chuen-chun, drawing an analogy," the spread of an epidemic is like crime. No matter how tight the net gets, it is hard to avoid having the odd fish slip through. In particular, with population increasingly packed into urban areas, this creates new opportunities for communicable diseases to spread. "
她打了一個比喻，「傳染病的發生就像人類犯罪一樣，防範措施再嚴密，還是難免有漏網之魚；尤其大都市人口愈來愈密集，也使得傳染病的傳播有許多可乘之機。」