雁

"Species of waterbird that resembles a small Canada goose, with dark back, white face, and black neck and bib ."

雁形目鸭科水禽。学名Branta leucopsis。类似小型黑额黑雁。背色暗，脸白色，颈和喙周围黑色。。

"Species of waterbird that resemble s a small Canada goose, with dark back, white face, and black neck and bib."

雁形目鸭科水禽。学名Branta leucopsis。类似小型黑额黑雁。背色暗，脸白色，颈和喙周围黑色。。

Newspaper December 11 (Reporter Zhu Tao Yin chapter Security) this morning, Xiang-Gui railway expansion renovation project started in paragraph mobilization Hunan Hengyang City, the General Assembly in雁峰Baishazhou Southern District held the outer ring.

本报12月11日讯今天上午，湘桂铁路扩能改造工程湖南段开工动员大会在衡阳市雁峰区白沙洲南外环线隆重举行。

My sons, Aaron and geordie, served as goose wranglers, manoeuvring the birds in and out of their pens

我的两个儿子，阿伦和乔迪，是训雁助手，每天将雁从雁栏里赶出赶进。

The investigation results showed that there were 26 species of the waterfowl of Anatidae, belonging to 7 orders, of which 1 species belong to gradeⅠ key state-protected species and 3 species (Cygnus columbianus, Anser albifrons and Branta ruficollis) belong to gradeⅡ key state-protected species.

结果表明：共调查记录到雁鸭类7属26种，其中国家重点保护动物4种，包括国家Ⅰ级重点保护动物1种［中华秋沙鸭］和国家Ⅱ级重点保护动物3种［小天鹅(Cygnus columbia-nus)、白额雁和红胸黑雁］。

Any of several small, dark wild geese of the genus Branta that breed in arctic regions, especially B.

黑雁一种黑雁属小型黑色野鹅，产于北极地区，尤指黑雁属，具有黑色的颈和头

The results demonstrated that MC1R gene of bird was relatively conserved. The results of phylogenetic analysis showed that consanguinity relations between mule duck, anas platyrhynchos and branta bernicla, anser caerulescens, anser canagica were close.The status of them were confirmed on zoologyl by means of molecular method.

可见禽类的MC1R 基因编码区序列具有高度的保守性；系统进化分析表明，半番鸭、北京鸭与雪雁、黑雁、皇雁亲缘关系相近，从分子角度验证了它们在动物学分类上的地位。

Three major clusters of numt sequences ( cyt b numt、 ATP8+ATP6 numt and ND4+ tRNA-His+ tRNA-Ser numt) were particularity amplified and sequenced from 10 species within Galliformes and A.galericalata. Comparison numts sequences with homologous mitochondrial partial genes get the different evolutionary characteristics and evolutionary speed compared to mtDNA, then examine the age of insertion of numts using the sequence divergence of numt from the mtDNA. Finally, joined Coturnix japonica、 Coturnix chinensis、 Lophura leucomelana、 Lophura swinhoii and A.albifrons mitochondrial sequences in GenBank, we study the importance function to phylogenetic research of mitochondrial genes and homologous numts.The evolutionary rate of Numts is lower than their authentic sequences of mtDNA, cyt b and ND4 gene evolve faster than homologous numts 2.5 times; ATP8+ATP6 gene evolve faster than numts 18.9 times in Galliformes. Numts show less codon position bias and transition bias under not phylogenetic pressure.

根据2004年3月GenBank登录的红原鸡核基因组草图与其线粒体基因组比对发现红原鸡核基因组中存在3段较长的线粒体假基因，利用PCR方法扩增鸡形目10种鸟类和雁形目中鸳鸯核基因组中3段numt序列：cyt b numt、ATP8及下游ATP6 numt和ND4+tRNA-His+tRNA-Ser numt，测序后分别比较线粒体基因与核同源numt序列的进化特点和进化速率，确定numt序列插入核基因组的时间，以及结合GenBank已登录的日本鹌鹑、蓝胸鹑、黑鹇、蓝鹇和1个雁形目物种——白鹅雁(A.albifrons)相应序列探讨两种同源序列对于鸟类系统进化发育重建的重要作用。

Besides keeping watch for predators and guarding their young, the two males defend their territory from other ganders, a role they seem to take extremely seriously...

除了持续注意掠食者及守护它们幼雁之外，一个它们似乎严谨看待的角色，二只雄雁从其他雄雁中保护它们的领土。

However, geese may form groups of a number of goslings and a few adults, called crèches.

加拿大雁也会由几只成年的雁和一群年幼的雁组成一个群组，称为「托儿所」。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷