I just sent it to a friend a few days ago, and I need it for my graduation thesis. In the university library, I feel that although not everyone is happy, most people are still quite good. My attitude is as sincere as possible, and I have repeatedly expressed my bother and gratitude, but I am still a little embarrassed. But I have to do it again. I send out questionnaires, and if I see someone listening or something, I will bypass them, but if I am resting and browsing my mobile phone, I will try. In fact, individuals don't like to send questionnaires like this. It is better to attract some people who volunteer to fill in the questionnaire to get benefits by sending red envelopes online. But now the channel is not so convenient, and it may be difficult to limit the sample of the questionnaire survey.