无根、茎、叶分化的植物体。
Thallus a plant body undifferentiated into stem, root, or leaf.
每个半球又进一步分化为四个区域或叶。
It is further divided into four regions, or lobes, in each hemisphere.
那么这些细胞是如何分化并形成像根、茎、叶和果实那样不同的结构的呢？
How then can these cells differentiate and form structures as different as roots, stems, leaves, and fruits?
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