The outer wall (extine) of the pollen grain is often diagnostic (see pollen) and very resistant to decay.
花粉粒外壁（花粉壁）通常为特异
的
腐烂。
The outer wall (extine) of the pollen grain is often diagnostic (see pollen) and very resistant to decay.
花粉粒外壁（花粉壁）通常为特异的腐烂。
声
：以上例
、词
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