People record previous history in paper books, but the quality is not good, so in order to make it more convenient to record knowledge in e-books for reading
People record the past history in paper books, but the quality is not good, so in order to make it easier to write down knowledge in e-books for reading.
People record the past history in paper books, but the quality is not good, so in order to make it more convenient to record knowledge in e-books for reading<br>