副词::prophylactically
"the doctor recommended several preventatives"
"contraceptive devices and medications"
"the swastika...a very ancient prophylactic symbol occurring among all peoples"
"preventive medicine"
"vaccines are prophylactic"
"a prophylactic drug"
Camphor as a prophylactic against cholera.
出自:J. FowlesTroops were here as a prophylactic against rioting.
出自:G. Black