草地上有一小缕干草被风吹走了。

A ___wisp of dry grass was blown away by the wind.

清晨的湖面上飘着几缕薄雾。

A few ___wisps of mist floated over the lake in the early morning.

她是个娇小的女孩，看起来弱不禁风。

She is a delicate ___wisp of a girl, looking very fragile.

她的笑容里带着一丝忧伤的痕迹。

There was a ___wisp of sadness in her smile.