This logic data model makes it impractical to directly load database tables by using bulk load tools that are described in the fourth method.
这种逻辑数据模型，使得使用第四种方法中描述的块载入工具直接载入数据库变得不现实起来。
Although the fourth method is a rapid way, it is a virtual way. So it is not suitable for real cities.
而第四种方法虽然快速，但是真实度不高，所以也不适合用来表示真实的城市。
The fourth method is to change the technical mode.
第四种方法是改变技术模式。
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