窗外,树上的小鸟正自由自在地唱歌,而老师则把我们囚在教室里做题。课在一天天地上,我的困惑却在一天天地增加。化学老师说氢气和氧气混合后会发生爆炸,于是,我们赶紧在笔记本上记下化学公式。但是我们谁都不知道氢气和氧气混合后是怎样爆炸的——是一定会爆炸,还是有条件地爆炸?是短暂性爆炸,还是持久地爆炸?老师似乎没有时间和你解释,平常对我们说得最多的一句话就是:“你只要了解就行了,这些不会考。” Outside the window, the bird on the tree is singing freely, and the teacher put us in the classroom. In the day and the day, my confusion increased day by day. The chemistry teacher said that hydrogen and oxygen would explode after mixing, so we quickly wrote down the chemical formula on the notebook. But none of us knows how the hydrogen and oxygen will explode after they are mixed – is it sure to explode or conditionally explode? Is it a brief explosion or a long-lasting explosion? The teacher does not seem to have the time to explain it to you and usually tells us The most common sentence is: “You just need to understand. These will not be tested.”