thickness

这块木板的厚度大约是5厘米。

The ___thickness of this wooden board is about 5 centimeters.

这层油漆的厚度让它干得很慢。

The ___thickness of the paint makes it dry very slowly.

浓密的树叶让我们很难看清天空。

The ___thickness of the leaves made it hard to see the sky.