1、im- "not, opposite of" => "这里引申为：free from, exempt from" + mun- + -ization(复合后缀：-ize, -ate, -ion).
2、字面含义：free from or exempt from public service or duty, exempt from service or obligation. 也就是不用做公共服务，免除了公共服务。
3、按咱们古代的说法：就是不用服劳役。由此引申为：豁免、免除、免疫。

1. Health workers spread the word about the benefits of immunization.

医疗工作者宣传关于接种疫苗的好处。

来自辞典例句

2. Appropriate immunization against tetanus must be given to all patients with full thickness burn injury.

对所有全厚度烧伤的病人都必须给予破伤风免疫注射.

来自辞典例句

3. Objective : To explore novel strategy for soman antidote by chemical immunization.

文摘:目的: 探索用化学免疫方法防治梭曼中毒.

来自互联网

4. Objective : To explore strategy for soman antidote by chemical immunization.

目的: 探索用化学免疫方法防治梭曼中毒.

来自互联网

5. GAVI was formerly the Global Alliance for Vaccines and Immunization.

它的前身是全球疫苗防疫联盟.

来自互联网