"unpaid wages"
"an unpaid bill"
"the soup kitchen was run primarily by unpaid helpers"
"a volunteer fire department"
"an amateur painter"
"gained valuable experience in amateur theatricals"
"recreational golfers"
"reading matter that is both recreational and mentally stimulating"
"unpaid extras in the documentary"
Most of their work is carried out by unpaid volunteers.absol.:
出自:Times Educational Supplement