"A bull in a glen."
Translation:Tarbh ann an gleann.
Tarbh anns a’ ghleann or tarbh sa ghleann
The article an/a’ in dative (after prepositions, like after anns) causes lenition (except for dental consonants: d and t – so anns an taigh in the house; and also l and n remain unlenited in speech after the article – as they do change lenited in speech normally but that’s never marked in writing – see eg. Leniting l sounds on Akerbeltz).