《圆周率π漫话》通过生动而丰富的内容和故事带领读者走过近四千年的漫长岁月，回顾有关圆周率π的悠久历史，揭示它的深刻内涵，并由此侧面看到数学发展对人类文明的不可忽视的重要推动作用。

The Longman Essential Activator is a dictionary with a difference. It's a production dictionary. Your students won't just 'like' this dictionary, they'll 'be crazy about it'!