善于

My sister is awfully good at looking after children.

be efficient at planning and management

know how to choose the right person for the right job; know how to make proper use of personnel

be well versed in the art of war

be good at meeting an emergency

be adept in public speaking

be good at management

be skilful at socializing

be ready at reckoning; be good at figures

have a ready tongue; be gifted with a silver tongue