同学们做作业的时候,难免会写错别字。有的同学怕浪费时间不用消笔液,而用白色的涂改液在上面涂,很不美观。所以,我想发明一种会报警的笔,如果在本子上写了错别字,钢笔就会自动发出警报。这种会报警的钢笔,就是在笔尖上安装 When students are doing homework, they will inevitably write typos. Some classmates are afraid to waste time without erasing liquids, and they are painted with white correction fluids, which is not beautiful. So, I want to invent a pen that will alarm. If a typo is written on the book, the pen will automatically issue an alert. This kind of alarm pen is installed on the pen tip.