复数： ducklings

The butterfly is really among the swan-ugly duckling school of butterflies .

这种蝴蝶可真是蝴蝶家族中丑小鸭变天鹅的一员了。

It has been the ugly duckling of international equity markets for years .

多年来它一直是国际股市的丑小鸭。

I think an ugly duckling has to be happy to be ugly .

我认为，丑小鸭必须乐于丑陋。

" Being a physicist looking at finance , I 'm the ugly duckling , out of my familiar realm , " says prof sornette .

索尔内特教授表示：“作为一位关注金融领域的物理学家，我是只丑小鸭，身处自己熟悉的领域之外。”