Duì zhèzhǒng lǚjiào-bùgǎi de wéifǎ xíngwéi bìxū yánchéng.
Such repeatedly unrepentant illegal behavior must be severely punished.
Tips
usage
Strongly negative, used for habitual offenders, problem students, or recidivists. Often paired with 屡犯 (repeatedly offending). Do not use lightly for minor slip-ups.
mistakes
教 here is read jiào (to teach / instruction), not jiāo. The idiom means 'repeatedly taught but not changing', not 'repeatedly changing teachers'.
