After publishing an article the day before yesterday to study and think, your family's cheats are really disgusting. Many people say that the quality of this set of cheats is really average, but the other two sets of mathematical thinking training compilations, commonly known as learning and thinking, are good counseling books with good topics.

Ben, Chinese characters. Originally refers to the roots of vegetation or the stems of grass and trees, and later extended to the center, main and root of things. I hope my answer is helpful to you.