这张纸是我用过的最薄的。

This is the ___thinnest paper I've ever used.

他是班上最瘦的学生，几乎看不到一点脂肪。

He is the ___thinnest student in the class, with almost no visible fat.

这片区域的树木最稀疏，阳光可以直射到地面。

The ___thinnest area of trees allows sunlight to reach the ground.

她的借口太牵强了，完全站不住脚。

Her excuse was the ___thinnest one I could imagine.