- Influenza may be prevented by active immunization with a polyvalent killed or subunit vaccine.
可以通过主动免疫接种多价灭活疫苗或亚单位疫苗预防流感。
- Although passive immunization now seems to hold the most promise, active immunization is not out of the running.
虽然目前看来是被动免疫最具潜力，但是主动免疫也不见得就此退出赛局。
