Then comes the chlorophyll-rich palisade mesophyll, where the bulk of photosynthesis occurs.

然后富含叶绿素的掌状中叶，大部分的光合作用在这里发生。

Above the palisade mesophyll and below the spongy mesophyll are epidermis cells, which produce a waxy coating called the cuticle.

掌状中叶以上和海绵状中叶以下表皮细胞，它们会产生一种称为角质层的蜡质涂层。

These cells are called palisade mesophyll and they're packed full of chlorophyll, the green chemical that plants use to absorb light.

这些细胞被称为掌状中叶，它们饱含叶绿素——植物用光线的绿色化物质。

Below that is the spongy mesophyll, which have plenty of space in between them for reactants to move through.

下面海绵状中叶，它们之间有足够的空间供反应物移动通过。

The nanotubes are so tiny that they squeezed through the leaf’s pores and into the mesophyll tissue.

纳米管非常小，以至于它们挤过叶子的孔隙并进入叶肉组织。

So the carbon dioxide comes in through the stomata, makes it's way through gaps in the airy layer of cells (called spongy mesophyll) at the bottom part of the leaf, then heads up to the palisade layer for photosynthesis.

因此，二氧化碳通过气孔进入，通过叶片底部通风层细胞（称为海绵状叶肉）的间隙，然后到达栅栏层进行光合作用。