Untranslated

Is there a reason why this is untranslated?

An untranslated sentence is like a flower waiting for pollination.

I feel like this sentence is probably better left untranslated.

Very many of my sentences are still untranslated into other languages.

The forms can be bizarrely funny when blown up to fill a canvas, as in "Supergastrico Compensado" (the artist prefers that his often punning titles remain untranslated), whose eroticized digestive systems have an appealing decorative flair.

They talked through complicated idioms, untranslated figures of speech and, most difficult, the difference between pronouns, a nonissue in English: When should characters who are close but still colleagues address each another as the informal “tu” or the formal “vous”?