在电气化铁路轨道电路中，两条钢轨即是轨道信号的传输线，又是电力机车牵引电流返回变电所的回流线。
In electric railway track circuit, the two steel tracks are both transmission line of the track signal and return line for electric locomotive tractive current back to electric substation.
由此表明，在突变截面附近的渗流区域中不存在回流和分离流，也不存在封闭的流线。
It is seen that there is no separated flow and closed streamline in porous media region near the sudden-changed cross-section.
由此表明，在突变截面附近的渗流区域中不存在回流和分离流，也不存在封闭的流线。
It is seen that there is no separated flow and closed streamline in porous media region near the sudden-changed cross-section.
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