What is the function of wheels?: About rolling and sliding issues: About rolling and sliding issues

Author: Jim
Publisher:
Publish Date: 2003-01-01
Features: "How? What? Why?" series, where kids can conduct experiments on their own under the guidance of this book! The entire book is printed in color pages, featuring adorable cartoon characters leading children on a journey through the ocean of knowledge! Exclusive copyright from UK Aladdin Publishing Company, with bilingual Chinese-English.