在别人的 帮助下，他打算通过交换使用机器上的头来在同一个磁带的一个声音上录制另一个声音。
With help from others, he figured out that by alternating the heads on his machine he could record one sounds on top of the other on the same tape.
交换文件系统比从磁带恢复快，而且还可以保留升级失败的文件系统供进一步诊断。
Swapping the filesystems over is quicker than restoring from tape, and you also have a copy of the failed upgraded filesystem for further diagnostics.
这320个Ethernet链接通过一个标准的以太交换器连接到带有磁盘、磁带、语言编译器和作业控制软件的标准IBM Power Systems机器。
These 320 Ethernet links are connected through standard Ethernet switches to standard IBM Power Systems machines with disks, tapes, language compilers, and job-control software.
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