雁

Different wildfowl can reach food at varying depths. Therefore, several species can live on the same wetland without too much competition for food

雁鸭类 ANATIDAE 不同水禽可取食到不同深度的食物，因此即使几种水禽生活在一起也不会因为食物而产生太多的竞争

The Zheng ,A pluked zither,is one of the most important instruments in Ancient China musics.

筝，一种带雁柱的琴，是古代中国音乐中最重要的乐器之一。

Swans are birds of the family Anatidae, which also includes geese and ducks.

天鹅属雁形目中的鸭科中的一个属，鸭科还包括鹅和鸭。

After two-cluster testing,branch length testing and relative rate testing ,two sequences(Melantitta nigra and Aythya americana) of 15 Cty b sequences were deleted because thek evolutionary rate were heterogeneous. The divergence between Anseriformes and Galliformes was chosen as an anchor point. Nucleotide sequence and amino acid sequence of 13 sequences data set was used to calibrated Anatidae molecular clocks. The results indicated that amino acid sequence is better than nucleotide sequence when divergence time is calculated with two kinds of sequences. The reliable divergence time of Anatidae were estimated with """"1+2TiTv"""" model.

经过二簇检验、分枝长度检验和相对速率检验，删除2条速率不恒定的序列后，用剩余的13条序列，以鸡形目与雁形目的分歧时间(89.8MYA)为锚定点，用顺序标定法标定鸭科鸟类分子钟的分析结果表明，用&1+2TiTv&分析得到的鸭科鸟类的分歧时间比较可靠；氨基酸序列用泊松校正模型和Γ模型估计的分类单元间的分歧时间则比较一致，表明氨基酸序列更适合用于鸭科鸟类分子钟的研究；用同一基因标定分子钟时，较长序列得到的结果标准误比较小；与核苷酸序列相比，氨基酸序列更适于用作分子钟的标定。

Mitochondrial cytochrome b gene were sequenced in 44 geese of Chinese domestic geese(15 breeds) and European domestic geese(2 breeds). Anatidae molecular clocks was calibrated with 2 consensus sequences which come from Chinese domestic geese and European domestic geese and 13 sequences obtained from GenBank.

本实验测定了中国家鹅15个品种、欧洲鹅2个品种共44个个体的细胞色素b基因全序列，分别取鸿雁和灰雁家鹅的一致序列与GenBank库中的13条鸟类(鸡形目4条、鸭科鸟类9条)细胞色素b基因部分序列(1045bp)共15条序列构成本研究的数据集。

Aves Anseriformes Anatidae Anas River.

鸟纲雁形目鸭科河鸭属。

Trumpeter Swans belong to the avian order Anseriformes, family Anatida, along with ducks and geese.

号手天鹅属于雁形目鸟类秩序，家庭Anatida ，随着鸭和鹅。

From May to June 2001~2005 (except 2003), in the Honghuaerji area of Inner Mongolia, sampling method was applied to investigate the Bird Communities Structure of Grassland-Forest Ecosystems, Results indicated that:(1)In the Honghuaerji area, Passeriformes, Charadriiformes and Anseriformes were main birds, in summer reproducing season.

2001～2005年5～6月(除2003年)，在内蒙古红花尔基地区，应用样方调查法研究了草原-森林生态系统鸟类群落结构，结果表明：(1)在红花尔基地区，夏季繁殖季节鸟类组成是以雀形目、鸻形目和雁形目为主。

Duck viral enteritis, or duck plague, was caused by duck enteritis virus.DVE was an acute, heat and septicaemic contagious viral disease that naturally affecting birds of the order Anseriformes.

鸭病毒性肠炎(Duck viral enteritis，DVE)，又名鸭瘟(Duck plague，DP)，是由鸭肠炎病毒(Duck enteritis virus，DEV )引起的鸭、鹅及多种雁形目禽类的一种急性、热性、败血性传染病。

The result makes clear, in the belt of 22 rivers appearance that evaluates in place, be in natural, close nature, degrade the reach of condition of natural, artificialize occupies total river to grow respectively 4.5%, 18.2%, 68.2% suffer factitious interference on the whole with river of dwell of 9.1%; wild goose more serious, be in degrade natural state.

结果表明，在所评价的22个河样带中，处于自然、近自然、退化自然、人工化状态的河段分别占总河长的4.5%、18.2%、68.2%和9.1%；雁栖河总体上受人为干扰较严重，处于退化自然状态。

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