1、主机后面圆形的孔洞，便是用来外接声音设备的。有些在机箱的后面，有些在机箱的前面，但长得都一样。2、这里有好几种颜色的孔，绿色孔便是声音输出的孔，红色孔是声音输入的孔。其他颜色的暂且可以不用理他们。[详细]
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