Issues may revolve around an universe of problems.Logical formLearned from1 sentences. (Metal disks) may revolve on a (drive shaft).Logical formLearned from1 sentences. A cylinder may be revolved.Logical formLearned from1 sentences. A (metal ring) may revolve above a platen.Logical formLearned from1 sentences. A wheel may be revolved to a letter.Logical formLearned from1 sentences. The economy may revolve around (nickel processing).Logical formLearned from1 sentences. Activities may revolve around products.Logical formLearned from1 sentences. A turntable may revolve at speed.Logical formLearned from1 sentences. A (star pair) may revolve.Logical formLearned from1 sentences. (Hydrogen atoms) may revolve around a proton.Logical formLearned from1 sentences. Object may revolve in an orbit.Logical formLearned from1 sentences. An economy may revolve around (subsistence agriculture).Logical formLearned from1 sentences. Politics of 1930s may be revolved.Logical formLearned from1 sentences. A perihelion may revolve about the sun.Logical formLearned from1 sentences. Clouds may revolve around a center.Logical formLearned from1 sentences.