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| primary source (Ремедиос_П); major contributor (to something: What was a major contributor to the fire spread in this incident 4uzhoj); fundamental source (Ivan Pisarev) | |||
| mother lode (The university has long been a mother lode of athletic talent, with many alumni joining the rarefied ranks of the professionals. Val_Ships) | |||
| basic design (картосоставления); basic document (картосоставления) | |||
| major source | |||
| the primary cause | |||
| principal source | |||
| основной источник: 82 phrases in 35 subjects |