pollen tube的用法和样例：

例句

A serologic reaction retards the growth of the pollen tube.血清反应阻止花粉管生长。
Activation of nucellar cells by discharge from the pollen tubes has been claimed.认为由花粉管的流出物能使珠心细胞活化。

The London Tube

Yvonne: This is 6 Minute English, I'm Yvonne Archer and Alice has kindly joined me for today's programme. Hello Alice. Alice: Hi Yvonne. Yvonne: Now Alice, how do you get around London? Alice: Ooh by bus, bicycle and usually the Tube. Yvonne: Aha, an

发表于:2019-01-07 / 阅读(95) / 评论(0)

六分钟英语

VOA标准英语2012--London's 'Tube' Plays Crucial Olympics Role

London's 'Tube' Plays Crucial Olympics Role Massive overhaul Head into the Tube and you never quite know what you might find. With 12 million passengers passing through every day - and three million more expected during the Olympics - the Tube is its

发表于:2019-01-13 / 阅读(88) / 评论(0)

VOA标准英语2012年(七月)

Friendliness on the tube

BBC Learning English London Life Friendliness on the tube Yvonne:I'm Yvonne Archer and this is London Life from bbclearningenglish.com. Hello! In today's programme, we're talking about friendliness on London's tubes. Is there any? As you probably kn

发表于:2019-01-16 / 阅读(170) / 评论(0)

伦敦生活

英国学生科学读本第56期:黄色的报春花(2)

One kind has in its eye a little green knob just like the head of a pin; these are called pin-eyed. The other kind has a fringe of little yellow dust-spikes instead; such flowers are called thrum-eyed. 其中一种的眼中，有一个小小的绿球，

发表于:2019-01-17 / 阅读(54) / 评论(0)

英国学生科学读本

英国学生科学读本第74期:蒲公英(2)

In spring, some hollow flower-stalks grow up from the centre of the rosette of leaves. Each stalk bears what looks like one large yellow flower. But if you pull one of these flower-heads to pieces, you will find that it is really made up of a great m

发表于:2019-01-17 / 阅读(38) / 评论(0)

英国学生科学读本

VOA常速英语2008年-Pakistan Erects Pollen Camps to Fight Seasonal

By Steve Herman Islamabad 18 March 2008 Every Spring, for the past several years, Pakistan's medical professionals have been establishing treatment camps for sufferers of pollen allergies. VOA Correspondent Steve Herman visited one of the camps, to f

发表于:2019-02-07 / 阅读(48) / 评论(0)

VOA标准英语2008年（三月）

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