This book consists of 60 illustrative sketches, including illustrations of 21 consonants and 39 vowels, speech organs, comparison of three a vowels, comparison of lip shapes of single vowels, distinction of front and back nasal vowels, putonghua tones, the pitch of the neutral tone and tones of disyllabic liaison. All these will contribute to a better understanding and command of correct methods of articulation. Each sketch is composed of four parts: the position of the tongue, the lip shape, the lower part of the mouth and pronunciation tips. All the illustrations are accurate, direct and convenient for teaching.