Faced with the gravity of this situation, the government, in order to guarantee people's minimum living conditions and to enable citizens not only to have enough to eat and wear but also to grow better off, cannot do as some people imagine -- wait for a high level of economic development to initiate a natural decline in birthrate. If we did so, the population would grow without restriction, and the economy would deteriorate steadily.
面对这样一个严峻的事实，为了保障人民有最起码的生存条件，为了使全体公民不仅能够得到温饱，而且生活水平能够逐步提高，中国不能象有些人想象的那样，等待经济的高度发展来引发人口出生率的自然下降，那样只会造成人口无限制增加，经济状况更加恶化。
MtDNA polymorphism in natural populations of D. albomicans was studied with 8 restriction endonucleases.
银额果蝇自然群体中的mtDNA多态性研究Ⅱ。银额果蝇的起源和分化①王文，凌发瑶，施立明
Restriction enzyme s occur in bacteria as part of a natural defense mechanism to guard against invading viruses.
限制性酶在细菌体内作为防御病毒内侵的机制。
Nitrogen is one of the most important elements that are vital to plant growth. Also, it is the most familiar restriction factor to plant individual, even natural ecosystem and manual ecosystem (Agricultural system is also included).
氮素是植物需求量最大的矿质营养元素，同时也是植物个体乃至自然生态系统和人工生态系统生长最常见的限制因子；它既是植物最重要的结构物质，又是生理代谢中最活跃、无处不在的重要物质——酶的主要成分。
This paper constructs FE models of SRM in detail and analyzes the vibration mode and natural frequencies with the Finite Element Analysis software package, and studies the influence of the stator structure of SRM, such as stator poles, ribs, mounting feet, terminal block and structure parameters, restriction condition on the SRM vibration behavior, the contrast to experiment result implies that the FEA model is close to the real model for analyzing the vibration characteristics of SRM.
本文基于有限元分析方法，主要研究了定子凸极、底座、散热筋，加强筋，接线盒等结构以及结构参数对定子固有频率和振动模态的影响，并且研究了约束条件下的SR电机定子振动特性。本文比较了模态实验与有限元分析结果，表明所建立的二维有限元模型对分析SR电机的振动特性有较好的精度。
Human survival and development depends on the nature, and human development in order to survive and all activities will affect the changing nature, and nature, in turn, through natural disasters, environmental pollution, ecological degradation, resource depletion have a negative impact on humans, restriction of human development.
人类的生存发展依赖于自然，同时人类为了生存和发展所从事的一切活动又影响改变着自然，而自然反过来又通过自然灾害、环境污染、生态退化、资源耗竭对人类产生负面影响，制约人类的发展。
Restriction enzymes occur in bacteria as part of a natural defense mechanism to guard against invading viruses.
作为抵抗病毒的自然防御机制的一部分，限制酶存在于细菌中。
Artificial nucleases are compounds that cleave nucleic acids and function as natural restriction enzymes with high activity and selectivity.
人工核酸酶是一类具有限制性内切酶的功能、能高效高选择性地催化水解DNA或RNA的断裂工具。
They consist of nucleic acid recognition and catalytic scission systems, and can mimic the natural restriction enzymes by combining these two functions.
它们一般由核酸结构识别系统及催化断裂系统组成，将两种功能有效地结合起来，可模拟核酸的酶切反应。
A limited liability company, the shareholders are usually only a natural shareholder or a juridical person shareholder, than other company form is more lack of restriction and supervision, appear abuse corporate personality of the situation is more common, serious harm normal economic order.
一人有限责任公司的股东通常只为一个自然股东或一个法人股东，较其他公司形式更为缺乏制约与监督，出现滥用公司法人人格的情形也更为常见，严重危害正常经济秩序。
However, the spider toxin separated from the natural venom of spider venom is far from being able to meet the needs of the research and development. Acquisition of spider toxin has been a perennial restriction for spider toxin research.
然而从天然毒液中分离的蜘蛛毒素远远不能满足研究和开发的需要，蜘蛛毒素的获取一直是限制其研究的难题。
It is a natural place of authority we have reached by transcending our personality, by shifting from a place of self-restriction to finding our spontaneity and responsiveness.
这正是真正权力之所在，我们达到了自我性格的转化，脱离了我们的自我限制，找到自发性和适应性。
If a loan contract between natural persons stipulates the payment of interest, the interest rate may not violate the regulations of the State regarding the restriction on the loan interest rates.
自然人之间的借款合同约定支付利息的，借款的利率不得违反国家有关限制借款利率的规定。
If the payment of interest is agreed in a loan contract between natural persons, the loan interest rates shall not violate the provisions of the State on the restriction on loan interest rates.
自然人之间的借款合同约定支付利息的，借款的利率不得违反国家有关限制借款利率的规定。
Relative humidity above 85% was required for occurring white muscardine disease, which was restriction factor on control effcet in natural environment;
白僵病的发生需要85%以上的相对湿度，这是自然环境中防治效果的制约因子；
However, it is difficult for peptidoglycan of natural synthesis to be used commonly owing to the restriction of the clinical application, because its activity is unstable, purity is not high, it contains impurities and it is easy to produce side effects etc..
然而天然提取的肽聚糖，存在活性不稳定，纯度不高，含有杂质，易产生毒副作用等弊端，在临床应用方面受到限制，很难被广泛地应用。
On the contrast, some developing countries levy export restriction on raw materials in order to develop domestic industries or to protect natural resources and the environment.
与此相反，一些发展中国家，为了发展国内产业或者保护资源环境，采取出口税和出口禁令等方式限制出口。
The characteristics and innovation of this study is:It`s the first time to study the landscape pattern of Helan Mountain-Yinchuan Basin system based on the theory of physical geography and landscape, 3S technologies also been adopted. and Present situation evaluation was been did. As a organic whole, Mountain-Basin was divided into first order and second order unit according the differentiation of natural factors in mountain-basin system. Through identifying restriction factors and adjusting layouts, the function. of Helan Mountain-Yinchuan Basin will been improved.
本研究的特色和创新在于：应用自然地理学和景观生态学及3S技术首次对外流河贺兰山——银川盆地的景观格局进行了研究，并对山盆系统景观现状进行了评价，将山体—盆地看做是一个有机的整体，根据自然要素分异划分一二级景观单元，辨识限制因子，合理安排土地利用，制定了单元管理对策。
According to grasping the symbolic moral of " Baicao Garden " and " Sanwei Study ", it's an allegorical portrayal about life's growth-course going through two phases of natural interest and cultural restriction necessarily, and both of them participate in shaping life-form.
对“百草园”、“三味书屋”意象的象征寓意进行把握，指出《从百草园到三味书屋》是对童年成长过程必然经历自然天趣与文化规束两个阶段、二者共同参与塑造生命形象的寓言写照。
In a basin, as a entia, close interaction and mutual restriction exists between various natural resources and different regions, and so, only with the integration of ecological protection and construction, can we solve all kinds of problems in a basin.
流域内各种自然资源和不同区域之间存在着密切联系，是相互制约和互相关联的统一体，流域的生态保护和建设工作必须有机结合起来，才能科学有效地解决流域的各种问题。