Chloroplast membranes form elongated flattened fluid-filled sacs called thylakoids. 在叶绿体基质中，有许多由膜封闭形成的扁平小囊，称为类囊体。
The internal structure of chloroplasts includes stacks of membranes called grana which are embedded in a matrix called the stroma. 叶绿体的内部结构是由多层膜形成的叶绿体基粒，其中包埋在基质中的基粒称子座。
