The little girl was as light as a feather.

那小女孩轻得很。

The new laptop is as light as a feather.

这个新的笔记本电脑像羽毛一样轻。

It's not that sweet and is as light as a feather.

那蛋糕不是太甜，非常清淡。

The rock beneath my head floated up in the air, as light as a feather.

我头下面的石头飘浮到空中，像一根羽毛一样轻。

Your profusion makes me saving; and if you lament over him much longer, my heart will be as light as a feather.

你的感情豪爽造成了我的感情吝啬；要是你再为他叹惜，我就会轻松愉快得要飞起来了。