四组

If xi + y is a complex number, then think of a quaternion as a very complex number.

假如xi + y是一个复数，那么我们可认为四元数是一组很特别的复数。

His favorite form is the jueju (five- or seven-character quatrain), of which he composed some 160 pieces.

他最喜欢的形式是绝句（ 5或7个字符的四行诗），他组成约160件。

To overcome this problem derived from the difference of language, Shakespeare chose to follow the idiomatic rhyme scheme used by Philip Sidney in his Astrophel and Stella (published posthumously in 1591), where the rhymes are interlaced in two pairs of couplets to make the quatrain.

为了克服来自于语言不同的问题，莎士比亚选择按照菲利普锡德尼在他的诗《爱星者与星》（于1591年在他死后出版）中所使用的习语方式进行押韵，这种方式是通过两组对偶句的交错押韵来构成四行诗。

The excited-state intramolecular proton transfer tautomerism reaction of 6-methyl-4-hydroxy pyri-midine monomers and dimmers was investigated by the ab initio method with the self-consistent reaction field with Tomas's polarized continuum mode and CIS theories at HF level on the basis of 6-311+G* and 6-31G basis set. By studying the potential energy surface, it was found that the monomer's ground-state proton transfer process together with the excited-state proton transfer process is a molecular system of four energy level, but dimmers were not, which can be used to explain the fact that UV-visible absorption and fluorescence spectra of monomer and dimers all corresponded to quinoid.

采用 ab initio HF理论的组态相关CIS方法和连续溶剂模型PCM，分别在6-311+G*和6-31G水平上研究了6-甲基-4-羟基嘧啶单体及二聚体激发态质子转移的异构化反应；对其反应势能面的研究发现，单体基态和激发态的异构化反应一起可以形成四能级的分子电子体系，而二聚体的却不能，由此解释了单体和二聚体的紫外吸收光谱和荧光发射光谱均对应于酮式构型的原因。

And finally the larger rear light clusters and the four exhaust outlets reinforce the impression of a powerful sports car, like the large tyres and the lovely alloys that are standard throughout the range.

最后，较大的尾灯组和四个排气口，强化了功能强大的汽车运动的印象，像大轮胎，即在整个范围内的标准可爱的合金。

The system consists of four stages: foreground segmentation, head extraction, facial component identification and recognizability measurement.

我们所提出的系统，分成为四个部份：前景侦测、头部区域撷取、人脸特徵侦测、可辨识度计算。第一个部份，先以一个统计式的方法来建立背景模组。

In the fourth chapter, theoretical study on self-imaging resonator of coherent beam combination is done in detail.

第四章对自成像腔相干组束技术进行了详细的理论研究。

Quarterback CHRIS REDMAN of the Atlanta Falcons, cornerback ANTREL ROLLE of the Arizona Cardinals and wide receiver-punt returner-kick returner DEVIN HESTER of the Chicago Bears are the NFC Offensive, Defensive and Special Teams Players of the Week for games played the 17th week of the 2007 season (December 29-30), the NFL announced today.

亚特兰大猎鹰四分卫克里斯。莱德曼、亚利桑那红雀角卫安特瑞尔。罗尔和芝加哥熊队外接手/弃踢回攻手/开球回攻手戴文。赫斯特分别当选为2007赛季第17周国联最佳进攻、防守和特勤组球员。

Use four yuan Group to achieve rotation matrix with six c...

使用四元组实现矩阵旋转功能，具有6维功能的摄像机。

The teams are divided into eight groups of four (in round-robin play), so each team is guaranteed three games.

参赛球队分成八个小组，每组四支球队。每个队都要进行三场比赛。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。