"a new jacket"
We can read the tips lesson by opening Duolingo site (via your web browser app) before we enter the lesson. In web version, when we want to enter the lesson, there are two options. Click the tips. We will find some explanations about the words.
Update: Or, check this link: https://www.duolingo.com/skill/ar/Alphabet-4/tips-and-notes
Finally I can copy paste the link :))