References in a document to a particular aspect of life in the country where that language is spoken.
Take this first line of a tractor review:
“You wait for one for ages. Then three come along at once. Brand new tractors from XXX Ltd”
A British reader, and in particular a Londoner, knows the first two sentences actually refer to buses. But if you were to translate that into Dutch or German, the meaning would be lost on the reader!