同时存在

But,in the variable se lection is a limitation,i.e.not all the selection variables have a significant contribution in the models.

同时，在这些应用中也反映了遗传算法在变量选择中存在的局限性，即不能保证选择的所有变量在模型中都有显著贡献。

In favour of arc length algorithm, the curve of fix points of balanced rotor to rotor speed, harmonious and subharmonious unbalance reponse curves are given. The Hopf bifurcation of balance rotor is computed by use of extent equation method.

同时应用扩展方程方法计算了平衡转子的Hopf分叉点，并用求得的Hopf分叉点参数进行数字仿真，证明极限环的存在，因此说明Hopf分叉点的计算是正确的。

In our study,two important lepidopteron pests,beet armyworm and cotton bollworm were surveyed for their endogenous piggyBac.As a result,endogenous piggyBac elements were found in these two insects,and one of the piggyBac elements isolated from the genome of cotton bollworm was intact and thought to be potentially active.1 Clonging and sequence analysis of piggyBac from beet armywormUsing PCR technique,with degenerate primers,a DNA fragment of piggyBac-like element was cloned from the genome of beet armyworm,spodoptera exigua hubner.The DNA fragment was 456bp in length,and the deduced amino acid sequence shares 50%- 78% similarity with other piggyBac elements from insects.But one stop code was found in this DNA fragment.

由于转座子很难用常规的RT-PCR和RACE技术进行克隆鉴定，故本研究在兼并引物PCR的基础上，利用inverse PCR和vectorret PCR技术，不仅调查了鳞翅目两种重要的农业害虫甜菜夜蛾和棉铃虫的內源piggyBac存在情况，同时克隆到了內源性的piggyBac转座子，并且从棉铃虫中获得了一个结构完整、具有潜在活性的piggyBac转座子HaPLE1.1甜菜夜蛾piggyBac转座子基因的克隆与序列分析采用PCR技术，利用兼并引物，从甜菜夜蛾基因组中克隆出一个內源性piggyBac类似因子的DNA片段，并命名为SePLE。

The molecular charge distribution of the reactivator is affect the reactivating efficacy directly. Moreover its association with hydroximic acid dissociation constant pAa closely, and it will have a great impact on reactivating ability indirectly.(3) There is likely to exist front molecular interaction between Cholinesterase Reactivators and OPC-inhibited AChE, the action sites mainly lie on the aromatic ring, the substitute R and the hydroixic acid group. They act on the aromatic residues of AChE by Π-Π conjugation .(4) The reached results by Comparative Molecular Field Analysis is useful to design new higher efficacy derivatives for 1, 2, 4-oxadiazole class nonquaternary Cholinesterase Reactivators.

2复能剂分子的电荷分布直接影响复活活性，同时对肟酸解离常数pKa具有重要影响，间接影响复活能力；(3)复能剂与磷酰化酶可能存在前线轨道作用，作用部位可能主要在芳香环及其取代基R和肟基上，与AchE的芳香族残基发生л-л电子作用；(4)通过比较分子力场法研究可以指导1，2，4-oxadiazole类非季铵肟胆碱酯酶重活化剂新化合物的合成，可能得到活性更高的复能剂。

In addition,the problems and difficulties involved are analyzed,and the means for expanding application of lignin in biochemical engineering are discussed.

同时分析了木质素在生物化工应用方面存在的问题和难点，探讨了扩大木质素在该领域应用的途径。

Both rainfall and variations in air humidity also increase the likeliness of the happening of red tide.

在赤潮生消过程中总是存在风向的转变，同时风速较小。

This paper applied an algebraic criterion to identify Hopf bifurcation for the six-dimensional red blood cell survival model, and analyzed stability of the generated limit circle by using projection method.

本文应用任意阶Hopf分岔代数判据对六阶红细胞存活模型的Hopf分岔点进行判定，同时利用投影法判断是否存在稳定极限环。

But at the same time, it has certain limitation .

但是同时，它也存在一定的局限性。

There are many researchers who are concentrating on APIL, but lots of them are put their eyes on the point of limiting the administration power. Few of them researches APIL on the subject of the people's rights on managing the state.

同时，理论界虽然对行政公益诉讼的研究的热情日益高涨，但他们在对行政公益诉讼的理论基础进行探讨时主要是从控制行政权，即"治官"的角度来研究行政公益诉讼存在的必要性，而忽视了行政诉讼的宗旨，基本上没有人从公民行使国家管理权，即"民治"的角度来探讨行政公益诉讼。

Based on lots of statistics, starting from China's textile and clothing export status quo, this paper expounds and analyzes the cause of formation of foreign major problems facing China's textile and clothing export—the limits of special clauses, regional integration of international trade, technical barrier, frequent anti-dumping. Besides, analysis has also been given on technical backwardness, unreasonable product structure, over concentration of export market, reduction of international competitiveness and large quantity but low price.

本文在收集大量数据的基础上，从中国纺织品服装出口现况出发，对中国纺织品服装出口面临的主要问题——特别条款的限制，国际贸易区域一体化趋势的影响，技术壁垒，市场上日益频繁的反倾销等进行阐述及原因分析；同时对中国纺织品服装业存在的技术落后，产品结构不合理，出口市场过于集中，国际竞争力下降和量大价低等问题及原因进行分析。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失