This book is a comparative illustration of 245 pairs/groups of words and expressions that often cause confusion in understanding and usage among students of Chinese as a foreign or second language. The illustration involves over 600 words and expressions, for which the author goes beyond merely giving explanations to their meanings, to focus on their distribution and usage, thus making the explanation more accurate and practical. A vacancy-filling piece of work in comparative studies of Chinese as a foreign language, the book serves as a good reference book for HSK candidates and teachers alike.