Shouldn't the blue phrases in the Graded Readers give additional information on those phrases? I remember there being a plus sign next to those phrases when I was reading Graded Reader 500 stories. Tapping those worked well, but the same buttons lead to Pleco crashing when I was reading Graded Reader 1000 stories. And now there are no plus signs anymore, but the phrases have a different color instead. But there is no additional explanation when tapping on those phrases.