thin是什么意思

例句：

The dog was painfully thin.

那条狗瘦得可怜。

The sheets have worn thin.

床单已经磨薄了。

She was pathetically thin.

她那时瘦弱得可怜。

He has a large body, but thin legs.

他身宽腿细。

His mouth tightened into a thin line.

他的嘴抿成了一道细缝。