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участвовать в обсуждении stresses
dipl.	be involved in the discussion; contribute to the discussion; participate in a discussion (и т. п.); be a part of the discussions (New York Times Alex_Odeychuk)
econ.	participate in a discussion
Makarov.	be involved in discussion
scient.	present a contribution to the discussion (на конференции и т.п. A.Rezvov)

участвовать в обсуждении: 6 phrases in 3 subjects

Diplomacy	1
General	3
Makarov	2