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，大部分的光合作用这里发生。

So now the leaf's palisade cells have water, carbon dioxide and sunlight, all they need to photosynthesise and make glucose (their food) and oxygen.

好，现叶片的掌状细胞有水、二氧化光，它们需要进行光合作用，制造葡萄糖（它们的食）氧气。