Terms for subject General containing experience in working

English	Russian
experience gleaned from working in many parts of the world	опыт, накопленный при работе во многих странах мира (Alexey Lebedev)
experience in working	опыт работы (e.g., with children Anglophile)
his opinion is based on long experience in working with the children	его мнение основано на большом опыте работы с детьми