1. Every year new strains of influenza develop. 每年都有新的流感类型出现。
2. A new influenza vaccine, administered painlessly in a nasal spray, is effective for children. 一种新的流感疫苗以无痛的鼻喷剂接种，对儿童有效。
3. Some British doctors have pointed out that one of Britain's worst waves of influenza happened soon after the new coins came into use. 一些英国医生指出，新硬币投入使用后不久，就发生了英国最严重的流感浪潮之一。
4. Parents are reluctant to subject children to the pain of injections, but adults, who are at risk of serious complications from influenza, are commonly vaccinated. 父母不愿让孩子承受注射的痛苦，但成人由于有可能出现流感严重并发症，普遍会接种疫苗。
5. Since children seldom develop serious complications from influenza, no significant public health benefit would result from widespread vaccination of children using the nasal spray. 由于儿童很少出现流感的严重并发症，因此为儿童广泛接种鼻腔喷雾疫苗不会带来显著的公共卫生效益。
