1. To immunize people against H5N1, two injections of the vaccine approximately one month apart are needed. 为获得对H5N1的免疫力，大约一个月需要分别注射该疫苗两次。
2. Since as early as 200 BC, people began to use disabled or minute amounts of infectious agents to immunize themselves against infections. 早在公元200年，人们就开始使用失活的或者微量的含传染物的药剂来使自己对传染病免疫。
3. According to an international team of physicists, the most effective way to protect a population from disease is to immunize people who have the largest networks. 一个国际物理学家小组的研究表明，保护人群免受传染病侵害的最有效方法，是让人际关系最广的那些人接种疫苗。
英英解释
v.
1. law: grant immunity from prosecution
2. perform vaccinations or produce immunity in by inoculation
