"One horse and one elephant"
Translation:Un ceffyl ac un eliffant
This is explained in the course notes - https://www.duolingo.com/comment/17638579
We strongly recommend reading the course notes for each new section before starting it. They are designed to explain the patterns being introduced, and to answer common questions. We update them from time to time in response to points raised.
Hi Ibis, how do you view the course notes in the app? I don't seem to be able to locate them. Diolch!
As explained in the link, they are not generally available in the app at the moment, although some people may be part of a trial to do so.
Each time you come to start a new section you could use a computer to go to the web version of the system and read the notes there and perhaps make a copy for reference.
Meanwhile, feel free to lobby Duo to make the web version available to mobile web browsers asap!