Natalia Volkova (asker) Jun 17, 2014:

Misha, you did not understand me. Perhaps, I just failed to explain my idea well...

The Misha Jun 15, 2014:

Natalia, you seem to be missing Mark's point. It doesn't matter that the Russian original says stremitelno which you perceive to be faster than mere "rapidly". What matters is that the most natural thing to say under the circumstances would be just what Mark suggested, rapidly changing world. Sure, you can say whatever you want, take you pick from here:

http://thesaurus.com/browse/rapidly

but if you want a natural option your choices may be severely limited, here as elsewhere. English, just like any other language, has its own cliches, and for the most part they do not match their Russian equivalents word for word.