The only major difficulty in dealing with SQL exceptions is the proper reclamation of database resources, such as the database connection.
在处理SQL异常时，惟一的难点是正确地回收数据库资源，比如数据库连接。
The real difficulty is writing network applications that scale from a single connection to many thousands of connections.
真正难的是要写出一个可以接纳少则一个，多则数千个连接的网络应用程序。
The USB could overcome some of the limitations of the traditional data acquisition card, such as the large volume, difficulty in extension, inconvenience in connection and low transfer rate.
USB的引入克服了传统数据采集卡体积大，难于扩展，连接不方便，以及数据传输率不高等缺点。
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