He rang for the guard to let him out.他按铃叫保安放他出去。Outside each door a guard sprang to attention as they approached.当他们走近时，每扇门外都有一名卫兵肃身立正。The guard eyeballed him pretty hard despite his pass.虽然他有通行证，卫兵还是直勾勾地盯着他。...
Vaccination and other prophylactic measures can be carried out.可以采取疫苗接种和其他预防措施。Anyone who wants to avoid the flu should consider getting a vaccination.如果不想得流感，就该考虑接种疫苗。Smallpox can be contained by vaccination.种牛痘疫苗可以控制住天...