The chimes of the bell die down, but as students at Pinglin Junior High School start studying in class another sound cut上课钟声响起，不过坪林国中教室里开始读书，但还有多了宁静中划过的另一个声音；离教室不到一百公尺，经过雪山隧道的车流噪音，抽风机运转的巨大声响，还有不定时的广播很容易分心。