Slow, continuous change may be the norm during periods of environmental stability, while rapid evolution of new species occurs during periods of environment stress.
缓慢的、持续的变化可能是环境稳定时期的常态，而新物种的快速进化发生在环境压力时期。
Nor should policy disputes be used as an excuse to undermine the stability and evolution of the relationship.
政策上的争议也不应当被用作破坏双方关系稳定及妨碍其进展的口实。
The existence of so many neighbours suggests that planetary systems tend to be stable, and stability is good for the evolution of life.
这么多邻居的存在说明了行星体系越来越趋向稳定，而这种稳定对生命的进化起着十分积极的作用。
The Middle East situation is now at a critical moment and its future evolution will have a great impact on peace and stability in the world.
中东局势正处在关键时刻，下一步走向攸关世界和平与稳定。
In order to discuss the stability of these solutions, a perturbation must be add to these solutions, and the evolution of the perturbation should be analysed.
为了讨论这些解的稳定性，必须在这些解的基础上叠加一个小扰动，并分析小扰动的演化。
During the evolution of styles, especially the usage from single to pluralism, it followed historical continuity and development, stability and variability, which are objective law.
扬琴流派的演变过程，从单一化向多元化进行，遵循着历史的继承性和发展性、稳定性和变异性的客观规律。
By combining the continuous power flow method with improved differential evolution calculation, the static voltage stability margin is found via optimal grouping of relevant variables.
在连续潮流法的基础上，结合经过改进的差异进化算法，通过对变量的组合优化，求取系统静态电压稳定安全裕度。
These advances include the researches on the submarine slope stability in qualitative and quantitative way, and the subsequent evolution of submarine landslides following initial sediment failure.
这些进展主要包括海底斜坡土体不稳定性的定性和定量研究、海底斜坡土体失稳后演变趋势的定性和定量研究。
One of the key problems in the nonlinear theory of the hydrodynamic stability is to determine the law of the evolution of the disturbance velocity amplitude.
求解扰动速度幅值的演化规律，是流动稳定性非线性理论的关键问题之一。
In the examples we get some evolution curves, such as the growth rates and shape functions, which are used to analyze the stability problems for the boundary layers of the fuselage and the wing.
算例给出了扰动幅值增长和形状函数等演化曲线，并对机翼、机身的边界层稳定性进行了分析和研究。
According to the transient simulation of seepage field and non-saturated shear strength theory, the stability of Sipu landslide and the space-time evolution of the critical slip surface were analyzed.
根据模拟的瞬态渗流场与非饱抗剪强度理论，对思铺滑坡的稳定性和最危险滑动面的时空演化进行了分析。
An equation for describing the evolution of agricultural machinery products possessions was established and then its nonlinear chaos property with the theory of stability was pointed out.
该文建立了描述农机产品社会拥有量的演化方程，并指出该方程具有非线性混沌特性。
The study on the headland-bay equilibrium shape rules is an important content which involves the stability and evolution of sandy coasts.
岬间海湾平面平衡形态规律的研究是砂质海岸稳定与演变研究的重要内容。
They are of low class and high authority. They are important forces to keep social stability and to promote institution evolution.
他们级别低，权利大，是维持社会稳定的重要力量，是制度变迁的推动者。
Finally, a theoretical formula is established, which describes the rule and stability condition of the morphological evolution for a void under mechanical and thermal load.
最后，本文给出了基于机械和热荷载共同作用下描述孔洞形貌演化规律及稳定性条件的解析方法及数值模拟结果。
Fourth, through the evolved gambling analysis, Hayek's spontaneous order has manifested its characteristics of existence, endogenetic, the stability, the evolution and so on.
第四，通过演化博弈分析，哈耶克自生自发秩序体现了其存在性、内生性、稳定性、演变性等特点。
Experimental results show that the algorithm for choosing a proper jumping rate outperforms the conventional differential evolution on the precision and the stability for medical image registration;
并且线性递减跃变率的对等差异进化配准算法比固定对等跃变率和线性递增跃变率的配准更精确、更稳定。
In the view of modern synthesized evolutionism, this paper analyses and considers the different indirection, essence and stability in bio-evolution under natural, artificial and polluted environment.
本文依据现代综合进化论的观点分析认为，由于选择因素的不同，在自然条件下、人工条件下以及污染条件下，生物进化的方向、性质及其稳定性也各不相同。
Heterogenous expression of active nitrile hydratase (NHase) was focused for its great potential in genetically evolution of the operational stability of NHase.
为从基因水平上改造腈水合酶，进行了诺卡氏菌腈水合酶基因的外源表达研究。
Heterogenous expression of active nitrile hydratase (NHase) was focused for its great potential in genetically evolution of the operational stability of NHase.
为从基因水平上改造腈水合酶，进行了诺卡氏菌腈水合酶基因的外源表达研究。
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