短语词组短语back -porch effect detail 回廊效应Back porch b 显示后沿;现后沿back porch effect 后肩效应;后缘效应;底版back porch interval 消隐脉冲后肩持续时间;详细翻译PANEL HSYNC BACK PORCH 小组hsync回廊;面板未水平同步后门廊back porch period 后廊期 返回 back porch