化学的乐趣在于看到不可见的东西变得可见。
That is what learning is. You suddenly understand something you've understood all your life, but in a new way.
教育者的心必须是一团活生生的火焰,是温暖和光明的源泉。
唱歌不仅是我的职业,更是我的热爱。