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| challenging; hard; strenuous; gnarly (shamild7) | |||
| ball-busting (сил: O Man, that was a real ball-busting job. I hope I never have to do that again Taras) | |||
| требующий напряжения: 23 phrases in 8 subjects |
| Aviation | 2 |
| Aviation medicine | 1 |
| Diplomacy | 1 |
| General | 12 |
| Makarov | 3 |
| Mechanic engineering | 1 |
| Programming | 2 |
| Psychology | 1 |