However, they differ in their vertical resolution. While 30 frames/sec NTSC has 525 lines (including vertical blanking, or retrace, regions), the 25 frame/sec rate of PAL is accommodated by adding 100 extra lines, or 625 total, to the PAL frame.
不过，它们在垂直分辨率方面存在差异。30帧/s 的 NTSC 有525行（包括垂直消隐或者回扫区），而通过在 PAL 帧上添加100条线，或者说，使之总共达到625条线，使 PAL 的25帧/s 的速率适应同样的标准。