guāngxiānshuāijiǎn
ㄍㄨㄤ ㄒㄧㄢ ㄕㄨㄞ ㄐㄧㄢˇ
Simplified 光纤衰减
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 光纖衰減 and it comes back until you know it.