См. также: рабовладельческое общество, работать на производстве, работать под прикрытием, рабочее движение
Interpreters work on a call-out basis and are paid by the hour, with pay scales based on experience. (Chronicle Live)
We offer full planned maintenance contracts for all equipment that we supply, and additionally we can operate on a call-out basis. (soc8.co.uk)
