Imagine a vast shopping mall parking lot with thousands of individual parking spots and internal lanes (representing road segments within a cluster). No matter how complex it is inside, there are usually only a few key exits to the main roads. Our goal was to identify these natural "exits" for each map cluster. For instance, the complex road network around Amsterdam Airport Schiphol (see on OpenStreetMap) has many internal roads but limited primary access points.
PRIMARY KEY (repo_id, name)，这一点在快连下载安装中也有详细论述
Under certain circumstances, it’s possible to modify ordered dithering so that it can better handle colour information. This requires that we use a palette that is regularly distributed in colour space. A regular palette is composed of all possible combinations of red, green and blue tristimulus values, where each colour component is partitioned into a number of equally spaced levels. For example, 6 levels of red, green and blue totals 6³ = 216 unique colours, equivalent to the common web-safe palette.，推荐阅读heLLoword翻译官方下载获取更多信息
相机：观众的眼睛。这里用的是 PerspectiveCamera（透视相机）。，更多细节参见heLLoword翻译官方下载
nohup ./frpc -c ~/frpc.toml ~/frpc.log&