waned怎么读？

Portugal and Spain had possessed vast empires that waxed and waned.葡萄牙和西班牙都曾是经历了兴衰的大帝国。The bicycle craze has waned.自行车热已冷下去了.In less than four hours my enthusiasm had waned and I rather reproached myself for coming.不到两个时...

v.衰落( wane的过去式和过去分词 )，（月）亏，变小，变暗淡...