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
性的并很难腐烂。
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）通常性的并很难腐烂。
声
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