正

Objective: The aim of this study is to investigate whether orthodontic extrusion movements have negative effects on the gingival tissues, and to detect the relationship between orthodontic tooth extrusion and the width of the keratinized gingiva.

目的：本研究的目的是调查是否正畸挤压运动产生不利影响的牙龈组织，并检测之间的关系正畸牙齿挤压和宽度的角化牙龈。

In a similar manner, the positive object creates an attractive gravitational field toward the positive mass.

同样，正物质对正质量产生一个引力场。

Let G be semisimple matrix group with Lie algebra g, T a fixed maximal abelian subalgebra of g, T the orthogonal complement of T with respect to the Killing form of g, and a, b 6 T a fixed regular elements.

设G为半单矩阵群，g为其Lie代数，T(来源：ABC论文91网www.abclunwen.com)为g的极大交换子代数，T~⊥为T关于g的Killing型的正交补，a，b∈T为固定正则元。

Golden ratio of Fibonacci is introduced into Hadamard transformation and orthogonal transformation matrix is got, a kind of transformation is produced based on golden ration-haar wavelet, and clear physical means of the orthogonal transformation in time and frequency domain are analyzed.

在此基础上研究了Fibonacci正交变换，进而将Fibonacci序列中的黄金比引入Hadamard变换，产生一种正交变换矩阵。

While they were busy with their first oysters, a head appeared at the hatchway of the staircase, and a voice said:-- I am passing by.

他们正吃着开头几个牡蛎时，有个人头从那楼梯的升降口里伸出来，说道：我正走过这儿。

Like Johnny Depp before him, he'd made a conscious decision to escape the heart-throb image and worked hard to become more a substantial actor.

真真正正写出了baby决心走出偶像派，做一个真正的演员，这也一直是baby想的和做的事情。

Oh, mother,"she said helplessly:" I am finished, I was this really the end!

哦，妈妈，"她无助地说："我完了，我这次是真真正正的完了！

We're living in a country where we have the highest drug death rate, we're living in a country which has one of the highest hep C rates in Europe.

我们正生活在一个国家，我们有最高的药物死亡率，我们正生活在一个国家最高的国家之一，丙肝率在欧洲。

Effects of reaction temperature, initiator dosage , residence time and dilution ratio of steam to n -heptane on initiated cracking performance of n - heptane were studied.

以硝基乙烷为引发剂，考察了反应温度、引发剂用量、停留时间和水蒸气稀释比（水蒸气与正庚烷的质量比）对正庚烷引发裂解性能的影响。

Two American female journalists held by North Korea were freed when Bill Clinton went to Pyongyang to meet Kim Jong Il, the Hermit Kingdom's ailing dictator.

两名被朝鲜扣押的美国女记者在比尔·克林顿去平壤会见金正日时才得以释放，重疾在身的金正日是朝鲜这个封闭国家的独裁者。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。