voluntary work

n.

义务工作；

Voluntary work
Benefits of formal voluntary work among older people. A review
Extending conceptual boundaries: Work, voluntary work and employment
Post-retirement voluntary work and psychological functioning among older Chinese in Hong Kong.
Guilty and helpful: an emotion-based reparatory model of voluntary work behavior.
Measuring the value of unpaid household, caring and voluntary work of older Australians
Measuring the value of unpaid household, caring and voluntary work of older Australians
Modus operandi of sexual offenders working or doing voluntary work with children and adolescents
Positive aspects of motivation in repetitive work: effects of lot size upon spacing of voluntary work stoppages.
Being a pretty good citizen: an analysis and monetary valuation of formal and informal voluntary work by gender and educational atta...