货运密度

Freight traffic density reflects the degree of business of freight traffic on transportation routes, and therefore provides important information for balancing transport capability, planning construction and upgrading of transport routes and studying the distribution of transport network.

货运密度是反映交通运输线路上货物运输量运输繁忙程度的主要指标。是平衡运输线路运输能力和通过能力，规划线路建设及改造、配备技术设备，研究运输网布局的重要依据。

Author puts forward the statistical method of freeway transportation volume and taking Nanjing-Shanghai freeway as an example, firstly obtains the passenger traffic, freight traffic, and turnover volume of passenger traffic, turnover volume of freight traffic and passenger transportation and freight transportation density of freeway in China.

提出了高速公路运输量的统计方法，并以南京—上海高速公路为例，首次统计了中国高速公路的客运量、货运量、客运周转量、货运周转量以及客、货运输密度。研究表明：在南京—上海通道内，高速公路和铁路起着同样的关键作用；货运方面，高速公路和铁路运送货物价值相差很大，两者是互补性的，客运方面，高速公路客运量中个性化出行与铁路是互补性的，而群体性出行与铁路是替代性的。

Means the parent directory, so this command means to execute "toolchain.sh," which is in the current directory.

代表父目录，所以这个命令就是执行当前目录下的"toolchain.sh"。

Yes,In fact,I'm on our city ream.

是的。事实上我是我们市队的。