Yi-fong Chiap-chung (預防接種; Yin-ngi : Vaccination), he li-yung yi?t-meu ch?-chi to ngin fe?t-cha thung-vu?t thi-nui ke ki-su?t, s?? chiap-su-fong tet-to ti-khong meu-yit thi?t-thin fe?t lau yi?t-meu siong-koan phiang-ngien ke mien-yi?t-li?t.