volunteering

n.

(military) a person who freely enlists for service

同义词：military volunteervoluntary

a person who performs voluntary work

同义词：unpaid worker

a native or resident of Tennessee

同义词：Tennessean

Volunteering
volunteering
Volunteering as Red Queen mechanism for cooperation in public goods games.
Volunteering and Mortality Among Older Adults: Findings From a National Sample
Neighbourly Acts--Volunteering, Social Capital and Democracy.
Differential benefits of volunteering across the life course.
Phase transitions and volunteering in spatial public goods games.
Volunteering and depression: the role of psychological and social resources in different age groups
Citizens as sensors: Web 2.0 and the volunteering of geographic information
Student Council, Volunteering, Basketball, or Marching Band: What Kind of Extracurricular Involvement Matters?