1 主语：Education
谓语：is
表语：one ( of the key words of our time 做定语，修饰one)
2 主语：Play
谓语：is
表语：a part ( crucial, of development in most young mammals 都是定语，修饰part)
3 主语：Stories (about the problems of tourism 定语，修饰 stories)
谓语：have become （ 现在完成时）
表语：legion
时间状语：in the last few years