Tian Tian Zhongwen is a carefully graded, four-level Chinese reader series for upper-elementary to upper-intermediate Chinese language learners. Each book in the series contains 20 stories and the series is graded into one of four levels: Gold, Turquoise, Violet and Rose. Bicycle Kingdom & Other Stories belongs to the Turquoise Level of the series and is designed for low-intermediate level learners. The vocabulary amount is limited to the most commonly used 1,000 Mandarin Chinese words.