雌性单性生殖,孤雌生殖

female parthenogenesis的用法和样例：

例句

In nature, clones are derived from a single parental organism or cell by mitotic cell division, asexual reproduction, or parthenogenesis.在自然条件下来源于有丝分裂所产生的单个亲本细胞或生物体，还可能来源于无性繁殖或单性生殖。
Two diploid gametes may fuse to give a tetraploid zygote, or gamete may develop directly by parthenogenesis.两个二倍体配子融合可能产生一个四倍体合子，这样的配子也可以通过孤雌生殖直接发育而来。
However, reproduction is often by parthenogenesis since polyploid animals are often sterile.然而，它们常常是通过孤雌生殖繁殖的，因为多倍体动物往往不育。

英语范文背诵精华3.1 Male and Female Roles

In all societies, male and female roles are regarded differently. The mother role is universally carried out by women, which is biologically based. Roles defined by sex also characterize the economic

发表于:2018-12-07 / 阅读(113) / 评论(0)

老友记精校版第1季

Study: More Female College Students Than Ever Identify As Liberal

The victory of Donald Trump in the 2016 presidential election came as a surprise to many people in the United States. Most political observers predicted Trump would lose the election to Hillary Clinton. But he won, in large part because of older male

发表于:2018-12-07 / 阅读(76) / 评论(0)

2017年VOA慢速英语(六)月

英闻天下——482 Female Execs to Hire More Women in High Tech Jobs

Ditto is one of the latest high-tech companies to set up shop in San Francisco, California. The company has designed an interactive platform using high tech facial recognition software where you can check your appearance when trying out spectacle fra

发表于:2018-12-19 / 阅读(110) / 评论(0)

英闻天下

英语笑话：a female pharmacist 一个女药剂师

a female pharmacist A man asked a female pharmacist，Do you have Viagra? Yes， she answered. Does it work? he asked. Yes, she answered. Can I get it over the counter? he asked. You can if you take two at a time， she answered. Notes: 1. A man aske

发表于:2018-12-26 / 阅读(95) / 评论(0)

英语笑话（MP3+文本）

第22期: way, land, back, female, leave

说一口流利的英语，从简单的单词开始。听听，读读，背背，今天你的词汇量又增加了5个。单词/词义中英例句单词听读 way [ wei ] We have to go a long way t

发表于:2018-12-30 / 阅读(122) / 评论(0)

每日攻克5词

Take Away English-UK Female Singers in Crisis 危机重重的英国女歌星

Amy Winehouse feeling the pressures of fame One of the UK's top young female vocalists has cancelled a series of high-profile European concerts following a short stay in hospital after suffering severe exhaustion . Smokey-voiced jazz and soul singer

发表于:2019-01-02 / 阅读(174) / 评论(0)

Take Away English

英语语法：205 Woman Versus Female

Grammar Girl here. Today's show will cover the difference between the words woman and female. First we had Nancy Pelosi taking over as Speaker of the House, then Hillary Clinton running for president, and now we have Sarah Palin as the Republican vic

发表于:2019-01-02 / 阅读(106) / 评论(0)

英语语法 Grammar Girl

英语语法：217 When to Use Female Nouns

Todays topic is the use of feminine nouns such as actress and comedienne. These days, people often see such terms as sexist, but it's also common to hear at least some of them. So what exactly are the modern rules for using such terms? Actually, this

发表于:2019-01-02 / 阅读(93) / 评论(0)

英语语法 Grammar Girl

Female Genital1 Cutting

Broadcast: Feb 24, 2003 By Jill Moss This is the VOA Special English Development Report. Activists for the rights of women have declared a yearly observance to oppose the cutting of female sex organs.

发表于:2019-01-02 / 阅读(137) / 评论(0)

VOA2003（上）-社会广角

Conference in Kenya Pushes for Global Ban on Female Genital

By Cathy Majtenyi An international conference to press for the eradication of female genital mutilation in Africa and around the world opened in Kenya Thursday.

发表于:2019-01-07 / 阅读(111) / 评论(0)

VOA2004（下）--新闻盘点

AS IT IS 2016-02-13 UN: More Female Genital Mutilation Than Thought

AS IT IS 2016-02-13 UN: More Female Genital Mutilation Than Thought Millions more girls and women are victims of female genital mutilation than previously thought, said the United Nations (UN). UNICEF is the UN childrens agency. They said in a report

发表于:2019-01-12 / 阅读(121) / 评论(0)

2016年VOA慢速英语(二)月

VOA标准英语2012--Female Olympians Get Motivated for 2016 Games

Female Olympians Get Motivated for 2016 Games Ije Enwerem has been throwing the discus for four years. She's thought to be a contender for the next summer Olympics, in Rio, four years from now. Being female, she says, has made her work harder. No-one

发表于:2019-01-13 / 阅读(105) / 评论(0)

VOA标准英语2012年(八月)

VOA标准英语2012--USAID Boosts Female Entrepreneurs in Pakistan

USAID Boosts Female Entrepreneurs in Pakistan An accomplished embroiderer with no formal education, Jamila struggled for years to augment her husbands income by doing stitching and beadwork in a poor Karachi district. Thanks to USAID-funded business

发表于:2019-01-13 / 阅读(90) / 评论(0)

VOA标准英语2012年(三月)

VOA标准英语2009-African Activism Against Female Circumcision

By Carolyn Weaver New York City 18 November 2009 A new film focuses on the fight by African activists against an ancient practice that is still performed each year on millions of girls: female circumcision, often known as FGM, or female genital muti

发表于:2019-01-14 / 阅读(120) / 评论(0)

VOA标准英语2009年(十一月)

Female Astronauts to Be Sent into Space on Shenzhou 10

China's first female astronauts could be sent into space on Shenzhou 10, which is scheduled to be launched in the coming two years. CRI's Shuangfeng files this report from Jiuquan. It has been 48 years since the first female astronaut in the world, V

发表于:2019-01-19 / 阅读(119) / 评论(0)

世界各地新闻集锦

Female Hormones and Heart Disease

80 雌性荷尔蒙不能缓解心脏病发作 DATE=8-9-01 TITLE=SCIENCE REPORT- Female Hormones and Heart Disease BYLINE=Nancy Steinbach （Start at 59

发表于:2019-01-30 / 阅读(119) / 评论(0)

科技之光

ECONOMICS REPORT - Up to 1.6 Million Female Employees Could

ECONOMICS REPORT - Up to 1.6 Million Female Employees Could Be Included in Sex-Discrimination Case Against Wal-Mart By Mario Ritter Broadcast: Friday, July 02, 2004 This is Bob Doughty with the VOA Sp

发表于:2019-01-30 / 阅读(120) / 评论(0)

健康与经济

DEVELOPMENT REPORT - Study Links Custom of Female Cutting to

DEVELOPMENT REPORT - Study Links Custom of Female Cutting to Infertility By Jill Moss Broadcast: Monday, August 29, 2005 I'm Bob Doughty with the VOA Special English Development Report. New research s

发表于:2019-01-30 / 阅读(112) / 评论(0)

农业与发展

Freed U.S. female hiker leaves Iran

TEHRAN, Sept. 14 (Xinhua) -- One of the three detained （被扣留的） U.S. hikers（徒步旅行者） left Iran on Tuesday evening after being released on bail of 500,000 U.S. dollars few hours earlier. Xinhua reporter was told in Tehran's Mehra

发表于:2019-02-03 / 阅读(88) / 评论(0)

英语新闻

2007年VOA标准英语-UNICEF Urges End to Female Genital Mutilation i

By Lisa Schlein Geneva 18 September 2007 The United Nations Children's Fund says the practice of female genital mutilation remains unacceptably high in Egypt.But, a UNICEF representative tells VOA the Egyptian government is committed to ending this

发表于:2019-02-12 / 阅读(157) / 评论(0)

2007年VOA标准英语（九月）

最新学习文章

热门学习文章

热门标签

英语听力 VOA标准英语 VOA 英语歌曲口语听力提高听力材料听力教程英语学习 NPR 英语口语 VOA慢速英语美国国家电台儿童英语 VOA英语小学英语 cnn VOA常速英语标准英语英文歌曲听电影学英语英语单词英文电影慢速英语 CRI 美联社新闻美国有线新闻加州分级澳洲新闻流行歌曲常速英语 ABC新闻快递疯狂英语英语读物听力棚车少年经济学人英语词汇商务英语 VOA双语新闻 BBC 中国电台大学英语 Treasures 加州语文 BBC英语英语听力网站 VOA英语教学词汇万花筒 SSS VOA英语听力 AP 新概念分级英语英语广播听力精选英语播客英文绘本 TED演讲赖世雄英语MP3 CCTV9英语新闻 lesson 英语新闻初中英语学英语英语语法历史上的今天英文广播剧英语游戏原版英语小说英语有声读物书虫英语牛津英语读物访谈录新闻一分钟考研英语英语每日在线听新闻 Us 新概念英语地道英语单词第二册自然百科高中英语 sports 实用英语 MP3听力辛沛沛 ESL英语第一册英语每日一句 unit 新东方 GRE 每日一词 BBC听力

学英语单词