[Vo-pervykh]
"firstly, first of all" is Во-первых in Russian.
Во-первых means "firstly, first of all" in English.
Listen to the pronunciationWord #1287 of 6,000 by frequency in Russian.
Во-первых, я хочу поблагодарить всех за помощь.
Firstly, I want to thank everyone for their help.