这块木板的薄度让它很容易弯曲。

The ___thinness of the wooden board makes it easy to bend.

她的瘦弱让医生建议她增加一些体重。

Her ___thinness made the doctor suggest gaining some weight.

油漆的稀薄使得涂刷时需要多涂几层。

The ___thinness of the paint required applying multiple coats.

她的论据明显缺乏说服力，论点显得很薄弱。

The ___thinness of her arguments made her case unconvincing.