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The clinical characters of oligodontia concluded from this study are following:(1) There is significant difference that more teeth absent and more existent teeth anomalies in patients of oligodontia/S group than in patients of oligodontia/I group, and the peg-shaped upper lateral incisor is the most frequently affected teeth with shape anomaly.(2) Both of the two groups have no significant differences in number of teeth missing between maxilla and mandible as well as that between left and right side.(3) The distribution of teeth missing is bilateral symmetry in both groups, but the frequency of teeth lost are different: excluding the third molar, in oligodontia/I group, the lower second premolar is the most frequently congenitally missing tooth followed by the upper lateral incisor, while in oligodontia/S group, the most frequently missing teeth are mandibular canine and maxillary lateral incisor. Nevertheless, the first molars are the most stable teeth in both groups.(4) In oligodonita/I group, the mean mesiodistal dimensions of all type of existent teeth are significantly smaller than normal value. It is implied that oligodontia is not an isolated phenomenon, but is related to a complex of other dental changes.

对于口腔多个恒牙先天缺失的临床特点有以下初步结论：(1)综合征型先天缺牙患者较单纯型先天缺牙患者恒牙缺失数目更多，平均分别为23.9个和14.9个，且现存牙齿有更多的形态异常，分别为7／10例（70％）和6／22例（27.3％），其中最常见的是上颌侧切牙畸形；(2)两种类型的多个恒牙先天缺失患者的缺牙数目在上下颌及左右侧之间均无差别；(3)两种类型的多个恒牙先天缺失患者在缺失牙位上均呈对称分布，但在具体牙位上有所差异：不计第三磨牙，单纯型先天缺牙最常缺失的牙位是下颌第二双尖牙、其次为上颌侧切牙；而综合征型先天缺牙最常缺失的牙位是下颌尖牙和上颌侧切牙；无论何种情况，第一磨牙均为牙列中最稳定的牙齿；(4)在单纯型先天缺牙患者中，现存恒牙的牙冠宽度较国人正常值偏小，差异显著，提示牙齿形态与多个牙先天缺失有一定相关性。

The principal conditions acromegaly sclerosis: from fingertip to the metacarpophalangeal joint or front-toe metatarsophalangeal joint symmetry of the skin thickening and tension, this change could also affect the whole body, face, neck and trunk.

主要条件肢端硬化：从指端到掌指关节或趾端到跖趾关节的皮肤呈对称性增厚、绷紧，此变化也可累及整个肢体、面部、颈部及躯干。

Compared with scalar wavelets, multiwavelet offers simultaneous orthogonality, symmetry and short support, which is not possible for scalar wavelets, and it plays an important role in the signal processing. Especially in increasing identification efficiency and reducing misdeem ratio of aviation picture in military reconnaissance, multiwavelet plays a more important role.

多小波技术把十分重要的光滑性、对称性、正交性、有限支撑等完美地结合起来，弥补了单小波的不足，为信号处理领域开辟了新纪元，尤其在提高军方侦察航空图像的判读效率、减少误判率方面更具有十分重要的意义。

I feel the delicate symmetry of a leaf. I pass my hands lovin---gly about the s mooth skin of a silver birch or the rough shaggy back of a pine.

我感到了树叶精妙的对称美，通过手的抚摸，我感知到了白桦树树皮的光滑，或是松树厚树皮的粗糙。

It requires nonconventional methodologies and strategies for Quantum chemistry to treat excited states, especially for the excited states that have the same spin multiplicity as the ground state and has no symmetry.

利用量子化学方法计算分子的激发态需要非常规的方法和策略，特别是对那些具有与基态相同的自旋多重度而又没有任何对称性的分子的较高激发态。

The stable geometry of ground state was the planar structure with the Cs symmetry, but the stable structures of excited states were changed to the nonplanar structure.

预测了在低能激发态时FONO2分子的几何结构发生了很大变化，从基态的平面构型转变为空间的几何构型。

I want my life, the only life of which I am assured, to have symmetry... But the course of my life, when I look back, is as orderless as a trickle of water that is diverted and guided by every pebble and crevice and grass-root it encounters.

我希望我的生命——我仅有的这个生命——有条有理……然而当我回首往事，却看见我的生命历程杂乱无章，就像涓涓溪流，路遇碎石罅隙、流经水草根蔓，每每因此而改变方向。

The result is that temperature distributing is along thickness direction and nonlinear, temperature stress distributing is symmetry about lengthways axis of the wall, and the temperature stress in the corner of the windows and osculant part between the wall and the beam or the pillar is bigger than the other part.

结果显示混凝土砌块整体建筑的温度是沿墙体厚度方向分布的；温度应力的分布是关于墙体纵向对称轴对称的，在洞口端角处以及圈梁、构造柱与墙体的接触处温度应力相对较大。

The structure analysis indicates that the reverse symmetry ligand H4LB molecules are linked into a 2D supermolecular network by two types of hydrogen bonds. One type occurs between the oxalamide oxygen group and the phenol hydroxyl qroup of the nearest molecule with d=2.906(2) and ∠O-H…O=151.8°. The other type is between the oxalamide nitrogen group and the oxalamide oxygen group of anther molecule with d=2.849(2),∠N-H…O=158.7°.

晶体结构研究表明配体H4L为顺式桥联分子，晶体中存在两种氢键，一种是草酰胺基团的O原子与苯环上的酚羟基形成O-H…O氢键[d=2.906(2)，∠O-H…O=151.8°]；另一种是草酰胺基团的氨基与相邻草酰胺基上的O原子形成N-H…O氢键[d=2.849(2)，∠N-H…O=158.7°]，通过上述两种氢键将化合物H4LB连接成二维网络结构。

Methods The type,shape,symmetry and branches of the superficial palmar arch were observed on 40 cases of hand specimens.

对20具成人尸体的40例手进行层次解剖，充分暴露掌浅弓，观察其类型、形状、对称性和分支。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。