The same way we say “Ah, Shucks!” Russians mutter “Da, Blin!” (Literally, “Yes, crepe.”) I gained insight into this phrase on a mild April evening, when I also discovered how our US cultural expectations sometimes rendered ordinary tasks like ordering dinner somewhat less than forthright. This excerpt comes from “American on Display,” the journal I kept on my first trip to the USSR in 1990 as a bilingual guide on Design USA, a cultural exchange exhibit of American life to …