. Official website introduced that we know that Dayi Customization is a training company established on 20 10, providing all-round services to the public. The company has a legal business license, which means it has been audited and recognized by government departments. In addition, Dayi Customization enjoys a good reputation in the industry, which shows that it has certain influence and achievements in the training field. To sum up, it can be said for sure that the large-scale system is effective.