Since a mine pumping system can generally be simplified into a complicated pipe-linesystem in series, the transient process is simulated by a method of characteristic line.
根据矿井排水系统一般可以简化为串联复杂管路系统的特点，采用特征线法模拟其断电停泵的瞬变过程。
2
It all starts in the basement. This line leads from a hatch in the coal room to this pipesystem here.
越狱从地下室开始，这条线路是从暖气室的一个出入口通到这个管道系统。
3
The output from this is huge, even on a lightly loaded system, so you typically either supply the name of a directory as a command-line argument or use a pipe to filter its output.