伸向子叶的子叶迹，直接由原生木质部极外面的一群薄壁组织细胞分化形成。
The extending cotyledon traces differentiate directly from the parenchymatous cells which locate on the outside of the poles of primary xylem.
它是世界现存最大、最完整的木质结构的古建筑群（architectural complex）。
It is the largest and most complete existing ancient wooden architectural complex in the world.
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