The outer wall (extine) of the pollen grain is often diagnostic (see pollen) and very resistant to decay.
花粉粒
壁（花粉壁）通常为特异性的并很难腐烂。
壁；
壁The outer wall (extine) of the pollen grain is often diagnostic (see pollen) and very resistant to decay.
花粉粒壁（花粉壁）通常为特异性的并很难腐烂。
声
：以上例句、词性分类均由互联网资源自动生成，部分未经过人工审
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