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.
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