当清单建立时，在清单缓冲区中的行长度。
Line width of the current list in the list buffer during list creation.
MF文件中的行长度限制为 72 个字符。
The line length limit in MANIFEST.MF files is 72 characters.
考虑每条线带宽的需求，源阻抗、信号幅值和运行长度；
Take into account each line's bandwidth requirement, source impedance, signal magnitude, and run length;
考虑每条线带宽的需求，源阻抗、信号幅值和运行长度；
Take into account each line's bandwidth requirement, source impedance, signal magnitude, and run length;
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