The ugly duckling drops his head.

丑小鸭垂着头。

You're an ugly duckling!

你是一只丑小鸭！

That beauty once was an ugly duckling.

那美女以前是个丑小鸭。

The ugly duckling grew bigger and bigger.

丑小鸭越长越大。

The ugly duckling became a beautiful swan.

丑小鸭变成了漂亮的天鹅。