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играющий важную роль stresses
gen.	instrumental (These innovative techniques were instrumental in the structure of the new product. • He was instrumental in getting that contract. It got rolling under is leadership. • Konev is a problematic figure in Central Europe. Although he was instrumental in the defeat of Nazism, he also oversaw arrests and deportations of Soviet refugees in the immediate aftermath of the war. washingtonpost.com); of the essence (Ремедиос_П)
Игорь Миг	landmark
играть важную роль
gen.	play an essential role (typist); count (VLZ_58); mean a lot (SirReal); feature prominently (A.Rezvov); make a figure; prove key (Кунделев); cut a conspicuous figure; go a long way; play a critical part (tavost); figure big (Ремедиос_П); figure; play an important part; make a big difference (A.Rezvov); play an important role (Post Scriptum); play a critical role (in ... – в ... Alex_Odeychuk)
Игорь Миг	be a major asset; be instrumental; adopt a high profile; be key
adv.	be important (Client-side load balancing is a good choice when latency is important. — Балансировка нагрузки на стороне клиента прекрасно подходит в случаях, когда величина задержки передачи данных играет важную роль. Alex_Odeychuk)
econ.	play a big part (A.Rezvov); take on enormous importance in (akimboesenko)
formal	be a significant contributor (MichaelBurov)
Makarov.	play a significant part; cut a good figure; cut a great figure; make a conspicuous figure; make a good figure; make a great figure
math.	be of paramount importance; be of great concern; play a key role
mil.	have a role to play (bigmaxus)
играет важную роль
slang	it goes a long way (Damirules)

играющий важную роль: 31 phrases in 8 subjects

Diplomacy	1
General	13
Makarov	8
Mass media	1
Mathematics	4
Measuring instruments	1
Programming	1
Theatre	2