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But to insert the genes into the cells, researchers have had to use viral vectors, which can turn the cells cancerous.

但插入的基因进入细胞，研究人员不得不使用病毒载体，它可以使细胞癌变。

Viral vectors capitalize on the motive of viruses to enter cells and insert their genetic material into the infected cells.

但其最高表达量却低于运动训练后质粒注射。

The flow field of free jet was measured by PIV. The instantaneous velocity vectors of the core region of jet was studied experimentally.

利用PIV技术测量了射流流场，得到了自由射流核心区的瞬时速度场，并对实验结果进行了分析总结。

But the interest protein was still expressed intracellularly. In this study, we have constructed expression vectors. Bovine IL2 has been expressed in Pichia pastoris, but in a fused protein form existing intracellularly. The effection of signal peptide and its procession on foreign protein secretion have been studied.

总之，本研究通过不同构建策略的表达载体的构建，实现了目的蛋白在真核体系中的表达，但以融合蛋白的形式存在于胞内，通过不同信号肽和信号肽加工位点的构建，探讨了影响目的蛋白有效分泌的原因。

Based on scale SVD transform, a target feature extracting method is proposed to solve this difficult problem. The experimental result shows that this method has favorable stability to target matrix's SVD feature vectors, and high invariant property to displacement, rotation and scale.

为解决这一技术难题，文中提出了基于尺度奇异值变换的红外图像目标特征提取方法，实验表明该方法提取的目标矩阵的奇异值特征向量具有较好的稳定性，对图像的平移、旋转和比例变化具有良好的不变性，是一种实用的特征提取方法。

The primary character feature curve by this method, called RPCGC (Ring-Projection Curve Gravity Center), has the invariant property with respect to rotation, and then the wavelet feature vectors from RPCGC has stability.

在字符信号f的多分辨率描述中，A〓f代表了信号的低频成份，反映了模式的基本形状，而D〓f代表了信号的高频成份，反映了模式的细节和噪声。

In this paper, we have used the theory of moment invariant to identify the orbit, constructed feature vector based on moment invariant, defined the distance between the two feature vectors, and proposed a new method of the identification, which ...

仿真与实验结果表明，该方法可以有效地识别常见的轴心轨迹，并收到了良好的效果

Presents the design of longitudinal control for ASTOVL lift-fan aircraft, a multi-variable, strong-coupling, complicated nonlinear system to make the system nonlinear offset and decouple, and the method used for linear system in designing the system to gain expectant flying qualities and the combination of aerodynamic control surfaces with thrust vectors to delay the control surfaces getting into saturation, and the minimum N-norm generalized inverse theorem of weighted generalized inverse adopted to apportion the moments commands, which make the control surfaces gain appropriate deflection and the simulation results to verify the dynamic inverse control laws designed really make the system nonlinear offset and decouple; when one command is given, only this output will response, and others do not response; when all commands are given together, the responses will be just the linear superpose of the response of each command, therefore the operation of the pilot will be simplified greatly.

摘 要： ASTOVL升力风扇飞机是多变量、强耦合、复杂的非线性系统，采用非线性动态逆理论设计控制律以实现系统的非线性对消及解耦，然后，采用线性系统的设计方法对系统进行设计，以使系统获得期望的飞行品质。同时，考虑到ASTOVL升力风扇飞机是由气动舵面和推力矢量融合作用的，为了延缓各舵面进入饱和的时间，采用加权广义逆中的极小N-范数广义逆定理分配力矩指令，从而使各舵面达到适当的偏转角。并将所设计的控制律进行了仿真，结果验证了所设计的动态逆控制律使系统实现了非线性对消和解耦，单个指令作用时，只有该项响应，其余不受影响；所有指令作用时，其结果就等于单个指令作用时的线性叠加，这样使驾驶员的操纵大大简化而易于控制，从而大大降低了飞行事故率。

Compared with the other image projection analysis methods, the proposed method has the following properties:（ 1 ） the scattering matrices are directly based on image matrices;（2） the efficient projection vectors are statistically uncorrelated;（3） the within scattering matrix is not necessarily invertible and some matrix inversions are not performed.

在ORL标准人脸库和NUST603人脸库上的试验结果表明，上述图像投影鉴别分析方法在识别性能上较以往的方法有一定的提高，尤其是特征抽取的速度有明显的提高。

Through matrix transformation of similitude,the characteristic values and vectors of coefficient matrix M,and invertible matrix P could be cacutated.

经矩阵相似变换，求得系数矩阵M的特征值、特征向量和可逆矩阵P。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。