The debate on the definition of a planet will provide educators with a textbook example to show how scientific concepts are not graven in stone but continue to evolve.

• 关于行星定义的争议是个机会教育，可以提供教育人员一个重要观念：科学概念并不是刻在石头上不可改变的箴言，而是持续在更新进步著。