The pollen of the weed is the main sensibiligen of hay fever in human.

豚草粉是人类枯草热症的主要致敏源。

Hummingbirds have discovered that nectar and pollen are very nutritious.

蜂鸟发现粉是很有营养的。

He developed an allergy to pollen.

他对粉过敏。

Pollen morphology of Plumbaginaceae in China.

中国白丹科粉形态研究.

Hay fever sufferers have a worse time when the pollen count is high.

粉计数高时，枯草热患者的日子就更不好过了。

The big,empty and abortive pollen grains are abserred at the stage of uninuclear microspore.

单核期的小孢子出现壁发育不良巨大及空粉现象。

Nectar and pollen are very nutritious.

粉是很有营养的。

The exine is composed of tectum, columellae, foot layer and endexine.

粉外壁由顶盖层、柱状层、底层及外壁层所组成。

The outer wall (extine) of the pollen grain is often diagnostic (see pollen) and very resistant to decay.

粉粒外壁（粉壁）通常为特异性的并很难腐烂。

A mass of waxy pollen grains transported as a unit in many members of the Orchidaceae and Asclepiadaceae.

粉块 Pollinium (pl. pollinia) 在许多兰科萝藦科物中，作为传粉单位的蜡质粉粒团。

Tapetum (pl. tapeta) A food-rich layer surrounding the spore mother cells in the anthers of vascular plants.

维管物粉囊包围孢子母细胞的富含营养物质的一层结构。

The pollen morphology of 10 species of Scorzonera genus in the Mongolian Plateau was observed by scanning electronic microscope.

用扫描电子显微镜观察了蒙古高原鸦物10个种的粉形态。

Pollen mother cells undergo meioses through simultaneous cytokinesis and give rise to tetrads of microspores, which are tetrahedrally arranged.

粉母细胞行减数分裂，细胞质分裂同时型，产生小孢子四分体，为四面体形。

(2) The pantoporate pollen of P. merrilliana shows that the species has vital taxonomical and evolutionary significance in Primula.

(2) 安徽羽叶报春的散孔型粉显示其在报春中有重要的系统意义进化意义。

The similarity of its heteropolar 3- or 6-aperturate pollen to the 3-aperturate pollen of Eudicots might result from convergent evolution.

其异极3沟或6沟型粉与真双子叶物的3沟粉的相似是趋同演化的结果。

Generative nuclei The two gametic nuclei formed by the division of the generative cell in the pollen tube of angiosperms.

在被子物粉管中的生殖细胞（应为雄原核译者注）分裂成两个配子的核。

These results indicate that callose metabolism is active and very important not only in microsporogenesis but also in microgametogenesis in rice.

营养细胞的细胞质中继续积累胼胝质，粉成熟对胼胝质在小孢子形成发育过程中的功能进行了讨论。

But fed with oakery pollen,indices as above were 9. 59 days, 37. 17 days, 3. 89 days,and 0. 86 per day,respectively.

而用青杠粉饲养，其发育历期长达9．59天，雌雄成螨寿命缩短为37．17天3．87天，日平均产卵量仅0．86粒。

It indicated that the frequency of formation of the true pollen-derived plantletsw ere significantly low in the anther culture of B. napes.

这些结果说明在油菜的药培养中可能有一少数粉株的形成。

As a result, this paper presents the 3D reconstruction segmentation display, and analysis results of pollen spore, chaperonin, head, cervical vertabra, tibia and carpale.

实现了粉孢子、分子伴侣、以及头颅、颈椎、胫骨、腕骨的三维重建分析测量与分割。