n.密纹唱片(long-playing record)
abbr.低压（=low pressure）
Porter's jazz LP has run its course on the record player to your left. 波特的爵士密纹唱片就在你左侧的唱片播放器里播放。
If you've ever played an old LP record where the hole was not quite centered, you've heard the pitch rise and fall with each revolution. 要是你播放过老式慢转密纹唱片，你就能听到，当唱片的空穴没有置于唱机正中央，唱片每转一周，音乐都会有音调高低的变化。
