thin比较级是thiner

　　例句

　　1.

　　The belt is invisible even under the thinnest garments.

　　这种腰带即便在最薄的衣衫下都看不出来。

　　2.

　　It was crazy of you to go skating on such thin ice.

　　到这样薄的冰上溜冰，你真是疯了。

　　3.

　　Such a thin padded coat cannot ward off the cold mountain wind.

　　这么薄的棉衣在高山上挡不住寒风。