用来把插卡固定到系统机箱上的金属板。
The metal plate used to fasten an add-in card to the system chassis.
声卡安装在系统机箱内，它在计算机后面有一些突出的接口，可供用户将扬声器、耳机和麦克风插在上面。
Housed within the system unit, a sound card contains connectors that project from the back of the computer so that you can attach speakers, headphones, and a microphone.
在微型计算机中，CPU是在一个单独的电子元件上，即微处理器芯片上，它在系统单元内或系统机箱内。
In a microcomputer, the CPU is on a single electronic component, the microprocessor chip, within the system unit or system cabinet.
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