我经常在电视里看到很多食品被不良商人加了一些有害的物质进去,这种有问题的食品普通老百姓很难用肉眼分辨出来。我想发明一种能检测食品里是否含有害物质的笔,如果含有能危害人体健康的有害物质,检测笔就会发出警报。假如每个人都带上一支这样的笔,那么不安全食品就会彻底远离大家的生活。 I often see on TV a lot of food was bad business people plus a number of harmful substances into the ordinary people with this problem food is difficult to distinguish with the naked eye. I would like to invent a pen that can detect whether food contains harmful substances or not, and if it contains harmful substances that can endanger human health, the test pen will give an alarm. If everyone has one such pen, then unsafe food will be completely away from everyone’s life.