預防免疫

prophylactic inoculation

to advance / in advance / beforehand / to prepare

to prevent / to take precautions against / to protect / to guard against / precautionary / prophylactic

to protect / to defend / to guard against / to prevent

to excuse sb / to exempt / to remove or dismiss from office / to avoid / to avert / to escape / to be prohibited

old variant of 絻[wen4]

immunity (to disease)

epidemic / plague