阅读下面两段文字，按要求回答问题。
                                                                                             乡 愁
                                                                                           小时候
                                                                                           乡愁是一枚小小的邮票
                                                                                           我在这头
                                                                                           母亲在那头
                                                                                           长大后
                                                                                          乡愁是一张窄窄的船票
                                                                                          我在这头
                                                                                          新娘在那头
                                                                                          后来啊
                                                                                          乡愁是一方矮矮的坟墓
                                                                                          我在外头
                                                                                          母亲在里头
                                                                                          而现在
                                                                                         乡愁是一湾浅浅的海峡
                                                                                         我在这头
                                                                                        大陆在那头

某校高二某班学生开展以“我们的民族精神”为主题的研究性学习，他们在活动中收集到以下材料。

材料一：校训是广大师生共同遵守的基本行为准则与道德规范，我国许多大学的校训都源自中国古代优秀传统文化典籍中的格言，它们实质上是民族精神在本校的体现和具体化。

材料二：今年“九一八事变”发生83周年之际，中共中央政治局常委、中央书记处书记刘云山出席“勿忘九一八”撞钟鸣警仪式并发表讲话。他在讲话中指出，以爱国主义为核心的伟大民族精神是中国人民从胜利走向胜利的决定因素，是中华民族从历史走向未来的强大精神力量。要大力弘扬伟大抗战精神，用坚持和发展中国特色社会主义的新成就告慰英烈、开启未来。