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gen. tricky business (applying eyeliner can be a tricky business. NOED. But running doubles is a tricky business. Marketing the lottery has always been a tricky business. LDOCE Alexander Demidov); tricky proposition (Reincarnation is a tricky proposition Alexander Demidov); there's an art to (There's an art to bagging groceries Alexander Demidov)
gen. takes skill and patience (SirReal); is not something you want to rush into (SirReal)
gen. tread carefully (when dealing with X SirReal)
дело тонкое: 11 phrases in 4 subjects
Quotes and aphorisms1