说明：  本书基于 MIT 编程思维写成，主要目标在于帮助读者掌握并熟练使用各种计算技术，具备用计算思维解决现实问题的能力。
(This book is based on mit programming thinking, the main goal is to help readers master and proficient in all kinds of computing technology, with the ability to solve practical problems with computational thinking.)