API很直观：您调用单个方法，并返回一个连接对象。
The API is straightforward: You call a singleton method and get back a connection object.
创建一个名为Application的类并编写如清单2中所示的相当直观的main函数。
Create a class named Application and write the straightforward main function shown in Listing 2.
方法直观简明，判断准确，并易于应用。
此方法理论上严密，解题步骤直观清晰，并对公路、水路、铁路等其它运输系统有普遍意义。
This method has a universal significance for high way, water route and other transportation systems.
此方法理论上严密，解题步骤直观清晰，并对公路、水路、铁路等其它运输系统有普遍意义。
This method has a universal significance for high way, water route and other transportation systems.
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