对称

Flowers perfect and hermaphroditic or occasionally unisexual, actinomorphic or zygomorphic,(2-)4(-7)-merous, axillary, in leafy spikes or racemes or solitary, or occasionally in panicles, all but Ludwigia with distinct floral tube, nectariferous within.

偶有的完全花和两性的或单性，辐射对称或者两侧对称，(2-)(-7)瓣，腋生的4，在多叶穗状花序或总状花序或单生内，萼片绿色或有色，镊合状排列。

In this paper, with domain analysis method for reactive power in nonsinusoidal, the formulas of apparent power and power factor both in nonsinusoidal and asymmetric conditions are describled.

本文从单相非正弦波形下无功功率的时域分析定义出发，导出三相不对称时视在功率的公式，从而获得非正弦波形又不对称下三相功率因数的计算公式。

The main idea is to lift the band degeneracy at high symmetry points in the Brillouin zone of crystals by lowering the structure symmetry of crystal. One way is introducing nonspherical atom configurations, another is introducing anisotropy in atom dielectricity.

设计的核心思想是通过降低光子晶体结构的对称性，消除光子能带在晶体的布里渊区高对称点上的本征简并，以获得完全的带隙我们采用两种方法，一种是将晶体的原子做成非球对称，另一种用各向异性的颗粒球做晶体原子。

The main idea is tolift the band degeneracy at high symmetry points in the Brillouin zone of crystals bylowering the structure symmetry of crystal.One way is introducing nonspherical atomconfigurations,another is introducing anisotropy in atom dielectricity.

设计的核心思想是通过降低光子晶体结构的对称性，消除光子能带在晶体的布里渊区高对称点上的本征简并，以获得完全的带稀我们采用两种方法，一种是将晶体的原子做成非球对称，另一种用各向异性的颗粒球做晶体原子。

Based on the wave equation in the acoustic fluid space and the theory of thin-wall structure, the uncoupling error in low frequency range about the nonsymmetrical coupled structure-acoustic analysis equation is studied.

该对称模型特征值的非负性及特征问题的可降阶性也在本文中进行了深入研究，同时指出了在复模态分析中应当注意的问题；（2）由声空间波动方程和薄板理论出发，对非对称声振耦合方程的低频解耦误差问题进行了研究。

For very long time, many research groups focus on using more than a stoichiometric amount of a chiral auxiliaries to obtain high enantioselectivity. There were mainly two sorts of processes reported on highly catalytic asymmetric addition of Grignard reagents to aldehydes. The former case was to transform Grignard reagent RMgX into other organometal reagents such as R_2Zn and R-Ti derivatives via complicated procedures at extremely low temperature. The later case was to link a chiral ligand to Mg in the form of organomagnesium amides or use chiral amine ligand catalyzing the alkylation of aldehydes.

格氏试剂对醛的不对称加成的报道大多需要大量的手性助剂以获得高的光学活性，而高度催化的格氏试剂对醛的不对称加成主要通过两种途径进行：一种是把格氏试剂转化成其他的有机金属试剂如R_2Zn和R-Ti化合物再对醛进行加成，反应通常在低温下进行；另一种是利用手性镁胺作为中间体或直接用手性胺催化来完成此反应。

Owing to the progressive accumulation of the ovalization of the tube cross-section during cyclic bending, the tubes buckle eventually.

从椭圆化－曲度的实验曲线中显示，在对称曲度循环弯曲负载时椭圆化会渐增且呈对称棘齿的变化，椭圆化会一直增加直到钢管发生皱曲。

This suggests persistent expression of SiDIV and ceasing of SiCYC1A and SiCYC1B in late peloric flower stage may generate the actinomorphic flower.

综此推测，变异型的花发育成辐射对称可能是由於开花晚期时SiCYC表现量下降及SiDIV持续表现，造成花发育后期两侧对称性的无法继续维持，而成了辐射对称花形式。

Besides,two fertile hybrids were obtained from symmetric somatic hybridization between bread wheat and tall wheatgrass,both of which were phenotypically similar to the tall wheatgrass parent.

本实验室成功的进行了小麦与多种禾草的体细胞杂交，并在小麦与长穗偃麦草的对称与不对称体细胞杂交中分别获得了长穗偃麦草/小麦渐渗系和小麦/长穗偃麦草渐渗系。

Considerable attention has really been focused on ionic liquids as "green" alternatives to classical environmentally damaging organic solvents in many fields such as in organosynthesis, material, catalysis, electrochemistry, biochemistry, physicochemistry, separation and so on. However, there have been only a few examples of chiral ILs have been reported so far, and ILs possessing chirality are having been synthesized aimed at application in asymmetric catalytic reaction.

离子液体在许多领域如电化学、有机合成、催化、生物化学、物理化学、材料及分离等的绿色替代溶剂技术引起了人们的重视，然而，有关手性离子液体的合成与应用的报道比较少，含有手性片段的离子液体不断被合成出来并期望在不对称催化反应中得到应用，但是成功的例子不多，使用手性离子液体在不对称催化反应中还在初始的探索阶段。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。