Let 1, 2, 3 ground line assistant to help you easily Xueqin row 1. Listen to the voice of APP ground row 2. The recorded sound of their favorite ground row 3. The mobile device at any time to practice, and can record daily practice results in the calendar APP Features Parent-child learning Increased willingness to children learning ground lines can be recorded loving mother ground line voice, so dear baby listening to the mother's voice, the joy of their own learning ground line to enhance the