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，通过叶片底部通风层细胞（称为海绵状叶肉）的间隙，然后到达栅栏层合作用。

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——植物用来吸收线的绿色化学物质。

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是表皮细胞，它们会产一种称为角质层的蜡质涂层。

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

然后是富含叶绿素的掌状中叶，大部分的合作用在这里发。

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

下面是海绵状中叶，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.

这些纳米管非常微小，可以穿过叶片的气孔叶肉组织。