"Don't be casual" should be the code of conduct for all of us. In learning, we should learn well and remember bit by bit. If we are careless, we will miss some knowledge, which may lead to lifelong regret. In the hospital, have you ever thought that if those "angels in white" are a little careless and prescribe the wrong prescription, it will bring unnecessary harm to patients' health, or even more serious consequences. In terms of railways, have you ever thought that if those railway workers casually check the broken track when they are overhauling the track, something will happen when the train runs on it, and who will be responsible for the consequences? On the street, if those "urban beauticians" casually row on the street for a long time, our city will be smoggy and our physical and mental health will be affected. There are countless examples of this.

Of course, what I feel most is my own personal experience. I remember in an exam, in the unit conversion, I lost 3 points for nothing because I wrote a zero. Although the score is not much, it is also a pity.

Thousands of miles of dykes were destroyed by ant nests. We should form a rigorous and serious habit from an early age and do everything around us in a down-to-earth manner.