同学们正在聚精会神地听老师讲课,不知从哪个角落发出了“嘎吧!”“嘎吧!”的声响,引起了同学们的回头张望。不久,另一个男生也开始在低头摆弄什么,窗边有个女生则若有所思地望着窗外,不时流露出会心的微笑。女教师不得不一面讲课,一面暗中巡视。她很快发现了那声音来自一个学生手里拿着的“打火机”。那个低头的男生手里摆弄着一种类似“积木”的东西,而凝眸向着窗外的女生似乎是正在收听一种“微型收音机” Students are attentively listening to the teacher lectures, I do not know from which corner issued “Ga! ” “Ga! Bar! ” Sound, aroused the students looking back. Soon, another boy began to bow around with something, a girl by the window looked thoughtfully out the window, from time to time showing a knowing smile. Female teachers had to lecture while secretly patrolling. She soon found out that the sound came from a lighter held by a student. The dull boy was tweaking a piece of something like “building blocks,” and the girl looking out the window seemed to be listening to a “mini radio”