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

单核期出现壁发育不良和巨大及空花粉现象。

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

豚草花粉是人类枯草热症主要致敏源。

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

花粉计数高时,枯草热患者就更不好过了。

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Hummingbirds have discovered that nectar and pollen are very nutritious.

蜂鸟发现花蜜和花粉是很有营养

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He developed an allergy to pollen.

他对花粉过敏

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Nectar and pollen are very nutritious.

花蜜和花粉是很有营养

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

花粉块 Pollinium (pl. pollinia) 在许多兰科和萝藦科植物中,作为传粉单位蜡质花粉粒团。

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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)通常为特异性并很难腐烂。

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

用扫描显微镜观察了蒙古高原鸦葱属植物10个种花粉形态。

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

(2) 安徽羽叶报春散孔型花粉显示其在报春花属中有重要系统意义和进化意义。

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The Kizilsu palynofloras are characterized by the dominance of coniferae, abundance of schizaeaceous ferns and presence of primitive angiospermous pollen.

克孜勒苏群粉组合以松杉目优势、蕨目海金沙科显赫和原始植物出现为特征

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

在被植物花粉管中生殖细胞(应为雄原核译者注)分裂成两个配核。

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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沟型花粉与叶植物3沟花粉相似是趋同演化结果。

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

而用青杠花粉饲养,其发育历期长达9.59天,雌雄成螨寿命缩短为37.17天和3.87天,日平均产卵量仅0.86粒。

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

实现了花粉、分伴侣、以及头颅、颈椎、胫骨、腕骨三维重建分析测量与分割。

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The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.

花粉外壁分为外层和内层,外层包括覆盖层、基粒棒和基足层等三层,内层只包含一层。

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Chromosome 12 of pollen mother cell of japonica trisomic rice (Oryza sativa L.) was successfully isolated using microglassneedles under the micromanipulator in this study.

首次以粳稻第12号三体为材料,采用玻璃针染色体微分离法,成功地分离到了水稻第12号染色体。

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Pollen disease is a kind of hypersensitiveness occurring on the sensitive individuals to the allergic pollen, and is the most representative disease of allergic diseases.

花粉症是敏感个体对花粉一种超敏反应,在变态反应性疾病中最具代表性。

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Both the filtrate and the dialyzate of agave pollen can activate the enzyme, thus proving that there was activating substance of the thiol group in agave pollen.

无论是剑麻花粉滤液还是透析液,都能使剑麻蛋白酶激活,证实剑麻花粉中含有巯基激活物质。

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The external factor like chemical agent, the cosmetics, the zootoxin, the fish and shrimp, the pollen, the dust, the solarization, scratch with the finger grasp and so on.

外因如化学制剂、化妆品、动物毒素、鱼虾、花粉尘埃、日晒、搔抓等。

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科学世界

Asthma attacks can be triggered by pollen, dust, harsh chemicals or scents.

灰尘、刺激性化学物质或气味可引发哮喘。

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北美大平原-野性新世界

Each spring, pollen from nearby plants is blown into the water.

春天,附近被风吹入池塘。

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科普小杂文

For instance, with its pollen bee colonies can pollinate other plants and keep them reproducing.

例如,蜂群可以给其他植物授粉,帮助它们繁殖。

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Asap SCIENCE 精选

Plants also give off scents which attract insects to spread their pollen.

植物也会散发气味,吸引昆虫传播

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影视资讯精选

I don't have my Claritin, and all I see around here is pollen!

我还没带着抗过敏药,而且这里全都是

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CNN 10 学生英语 20194

If you find pollen " upollen" you're going to hate this.

如果你发现了粉,你会讨厌这个

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VOA英语_健康

Wash after being outside to remove pollen from your skin and hair.

外出后清洗,去除皮肤和头发上

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VOA Special 20195

They found that ragweed plants produced much more pollen when carbon dioxide levels increased.

他们发现,二氧化碳浓度增加时,豚草产生了更多

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经济学人-科技

The extra pollen thus displaced probably explains how the sickly plants outproduced their healthy confreres.

充裕很可能是这些生病植株比它们健康同伴更高产原因。

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VOA Special 20203

At the time, small amounts of flower pollen were found in soil around the remains.

当时,在遗体周围土壤中发现了少量

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连线杂志

So technically pollen could be an antigen.

因此从技术上讲,可能是抗原。

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科学60秒 听力 20168

And now Leonard and her colleagues have discovered that bumblebees are pollen aficionados, too.

现在伦纳德和她研究团队发现,熊蜂也是爱好者。

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BBC 听力 201610

It can be anything from dust, to pollen to gunshot residue.

从灰尘到再到涉射击残留物都有可能成为痕迹证据。

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科学60秒-科学美国人 20207

They loaded the device with pollen suspended in a sticky gel.

他们给设备装上了悬浮在黏性凝胶中

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PBS趣味科普

Like, if you're a bee, these chemicals might send you out to hunt pollen.

比如,如果你是一只蜜蜂,这些化学物质可能会让你出去寻找

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CNN 10 学生英语 202212

And now, we're donating this bee pollen substitute to these farmers here.

现在,我们把这种蜂粉替代品捐赠给这里农民。

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TED-Ed(视频版)

But sometimes, the immune system accidentally discriminates against harmless substances, like pollen.

但有时候,免疫系统会不小心排斥无害物质,例如

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VOA英语_世界

They move pollen from part of the flower of a plant to another part.

它们把从植物一部分转移到另一部分。

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BBC 听力 20168

It is hay fever, an allergic reaction to pollen from trees, grass and other plants.

元凶其实是粉过敏症,这是人们对草木以及其他植物产生过敏反应。

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VOA英语_世界

It uses two different materials found at the site, ancient tree pollen and quartz grains.

它用到了在该地点发现两种不同材料——古树和石英颗粒。

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