perl - i命令在原地对file . txt进行修改，而perl -i.b ak则为原始文件建立一个副本，并在其名称后面添加.bak，以区别于新的、经过修改的版本。
In-place; perl -i.bak makes a copy of the original file and appends.bak to distinguish it from its new, modified version. Therefore, a command such as.
以结构拟动力试验为例，详细说明了基于计算命令控制试验系统的建立方法及试验流程。
The calculation command control method and testing flow for structural pseudo-dynamic testing were described in detail.
创建屋顶截面，以引导线作为引导，当采用曲线网格命令来建立曲面。
Create the roof sections to guide the roof surface when using surface from curve network.
创建屋顶截面，以引导线作为引导，当采用曲线网格命令来建立曲面。
Create the roof sections to guide the roof surface when using surface from curve network.
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