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The first three largest number of missing teeth is as follows: maxillary first molar, maxillary second molar and mandibular first molar. The first three largest number of resident teeth is as follows: mandibular cuspid, mandibular bicuspid and maxillary cuspid. The cases without occusal relationship account for 19.51%; and the cases which need occlusal reconstruction or occlusal elevation account for 19.51% of all the cases, while food impaction exists in 21.84% cases.

结果：本组老年人平均缺失牙齿9.10颗，缺失最多的前3位牙齿是上颌第一磨牙、上颌第二磨牙和下颌第一磨牙；余留最多的前3位牙齿是下颌尖牙、下颌第一双尖牙和上颌尖牙。19.51%的病例颌骨间无咬合接触关系，19.51%的病例修复时需咬合重建或咬合抬高；21.84%的病例修复前存在食物嵌塞。

The interaction between cutterhead of shield machine and soils was simulated. The investigation shows that there exists a wider range from active pressure to passive pressure for supporting face stability.

研究表明，仅从保证地表既不隆起又不沉陷的约束条件考虑，掘进工作面从主动土压力到被动土压力存在较大的范围。

Many websites lead you into a magical but virtual world that exists only in cyber-space and in the imaginations of its creators and visitors.

许多的网页把你引入了一个神奇而又虚拟的世界，它们只存在于电脑空间和它的创建者以及访问者的想象里。

Let F=LF be a s-closed local formation such that every minimal non-F-groups is solvable. It is proved that 1 If every cyclic subgroup of of order 4 and every minimal subgroup of G are contained in, then G is a F-group. 2 If there exists a normal subgroup N of G such that G/N∈F and every cyclic subgroup of N of order 4 is weakly c-normal in G and every element of N of prime order is contained in Z(superscript f subscript ∞), then G is a F-group.

设F=LF是一个子群闭的局部群系，满足每个极小非F-群是可解群，证明了：1如果G的任意极小子群和任意4阶循环子群都含于Z中，那么G是F-群；2如果存在G的正规子群，使得G/N∈F，且N的任一4阶循环子群在G中弱c-正规，N的任一素数阶元含于Z中，那么G是F-群。

Sterol is a kind of substance of full cyclopentane hydrogen skeleton, and exists in the nature in free form and binding form.

甾醇是环戊烷全氢匪为骨架的一种物质，在自然界中以游离态和结合形式存在。

In other words, localization can be performed based on a general scene. In this thesis, we adopt Spatial Gaussian Mixture Model in image segmentation to describe an image viewed by the robot in spatial domain without any artificial landmark. Secondly, we use a modified combination algorithm by Cyr and Kimia to combine similar data. It is found out that a monotonic relationship exists among the scene registered and its neighborhood in terms of distance. This phenomenon can be used to assist to localize the robot and this work demonstrate the feasibility by several experiments.

本论文中采用高斯混合模型(Gaussian Mixture Model， GMM)来描述空间中的场景，将场景概念化，这样任意的场景皆可以用高斯混合模型来表达，而无需加入大量的人工场景，接著将所获取的每个希望校正点的资料采用由修改后的Cyr and Kimia的结合演算法来减低及统合资料，当场景接近原本的当初建立的场景，经由最大可能性大体上会呈现单调的特色，将辅助机器人修正回原本的位置，以达到协助机器人定位的目标。

Actin is a highly conserved protein, which exists in almost all eukaryotic cells and has been proved to be essential for many cellular functions such as movement, morphology, growth, cytokinesis as well as other crucial events.

肌动蛋白是一类高度保守的蛋白质，存在于所有的真核细胞中，参与细胞分裂、运动、迁移、形态的维持、生长等许多重要生理活动。

Therefore, from viewpoint of economic evaluation, damnification of thestate-owned assets exists from the abroad IPO of Sinopec.

因此，从经济评价的角度来说，中国石化股票的海外上市存在着国有资产流失的问题；然而与此同时，我国的大量社会资本并没有机会享有这份国有经济发展的成果。

In the research of wireless communication module, there exists data conflict in transmission.

在该系统的无线通信模块研究中，会遇到实时数据发射的冲突问题。

Richard Dawkins said, The question of whether there exists a supernatural creator, a God, is one of the most important questions that we have to answer.

理查德道金斯说：至于是否存在超自然造物主，上帝、一个最重要的问题，我们要的答案。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！