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Одна ласточка весны не делает 8)

или.... весну не делает ??? :roll:

Yes, Rounder. :D
In fact, the very first swallows (birds representing spring and good weather) appear when the season is still bad...
In other words, it is not enough one single positive element...

"Una rondine non fa primavera".

Una = undeterminate article, female. "a" (in this phrase: "one single").
Rondine = swallow
Non = negation.
Fa = from the verb FARE, "to do" or "to make"....