translate into formal English 本文选取49个国家为样本利用2014-2019年OECD数据库的数字服务贸易面板数据研究分析数字贸易壁垒的发展趋势及特征在此基础上建立模型进行实证分析数字贸易壁垒对数字服务出口所带来的多重贸易效应。最后得到如下结论：

This article selects a sample of 49 countries and utilizes the panel data on digital trade barriers from the OECD database for the years 2014-2019 to research and analyze the development trends and characteristics of digital trade barriers. Based on this, a model is established to empirically analyze the multiple trade effects of digital trade barriers on digital service exports. Finally, the following conclusions are drawn: