An instructor in chemical warfare asked soldiers in his class: Anyone knows the formula for water?
Sure. That's easy, said one man.
What is it?
H, I, J, K, L, M, N, O.
What, what? reasked the instructor.
H to O, explained the chemistry expert.中文翻译：
生化战争课的老师在课堂上问士兵们：谁知道水的分子式？
当然，太简单了。一个士兵回答道。
是什么？
H, I, J, K, L, M, N, O.
什么，什么？老师又问道。
H to O，化学专家解释道。