volunteer : 51 phrases in 13 subjects |
Accounting | 1 |
Agriculture | 5 |
American usage, not spelling | 1 |
British usage, not spelling | 1 |
Economy | 5 |
Education | 1 |
General | 20 |
Health care | 1 |
Medical | 4 |
Natural sciences | 2 |
Politics | 2 |
Social science | 4 |
United Nations | 4 |