随着时代的发展,我们的生活水平有了进一步提高,如果社会治安不好,这里被偷,那里被盗,就会使人们不能安心工作,所以我想发明一种多功能门铃,让那些不法分子望而生畏。我发明的这种门铃最重要的部分是 With the development of the times, our standard of living has been further improved. If public order is poor, where the people are stolen and stolen there, people will not be able to work with peace of mind. Therefore, I would like to invent a versatile doorbell to make those illegal The molecule looks daunting The most important part of the doorbell I invented is