二是无源性荧光渗漏(Late leakage of an undetermined source, LLUS)，即FFA早期可见轻微的渗漏区，晚期渗漏明显，但渗漏边界不清楚，没有视网膜色素上皮脱离。
基于2个网页-相关网页
LLUs use equipment installed in a telephone exchange by a third party company, such as Orange, instead of BT.
BBC: NEWS | Technology | Orange broadband hit by outages
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