Translation:the letter ng
Have you read the Tips & Notes? Regarding the ng they say:
ng is said exactly as in English, but many English speakers are not familiar with pronouncing it at the beginning of a word. Put the back of your tongue to the roof of your mouth to make this sound. Please note that this is a single Klingon consonant.
If that doesn't make it clear, here's a technique that sometimes helps:. Say "Wing Ode" (like a poem about a wing). Then run the words together into "wingode". Now hold the "i" sound extra long as in "wiiiiiingode". Finally, stop the "i" sound and take a pause before continuing so it sounds like, "wiii ngode". It should now sound similar to the Klingon phrase wIy ngoD, meaning "tactical display fact".
And if you haven't been reading the Tips & Notes I want to make sure you know about them and where to find them.
If you are doing the course on iOS or Android, you cannot currently access the Tips & Notes through the app. To access the Tips & Notes, you will have to access the course using a web browser at https://www.duolingo.com/. You can still do it on your mobile device, but you will have to use the web browser instead of the app (or you can do it from a computer). When you click on a Skill, it will expand to reveal a Start button and a light bulb (and a key, which is not pictured below, but is how you can test out of a Skill).
If you click on the light bulb it will reveal the Tips & Notes and give you a detailed explanation of the grammar that is introduced in that Skill. If you have questions after reading the Tips & Notes for the previous and current Skills, then please return to the forum to ask your question, explaining what you didn’t understand or what seems contradictory to you.