Current theory holds that planets are made from disks of gas and dust left over after star birth.
现有理论指出：行星是恒星诞生之后的残留物——碟状尘埃和气体的产物。
In theory, planetary dust could block out UV rays, but the dust was bound up in the creation of those young planets.
理论上行星星尘可以把紫外线挡在外面，可在这些年轻行星的形成过程中，星尘是挤成一团的。
Scientists know planets form out of the discs of material around young stars, but theory says the transition from dust disc to planetary system is rapid and few objects are caught during this phase.
科学家们知道行星是从年轻的恒星周围的物质盘中形成的，但是理论认为从尘埃盘到行星系统的转变非常快，人们很少见到在这一阶段的物体。
The atmosphere dispersion theory was used to analyze the influence ol calm wind and gravity action on the diffusion of dust particles .
利用大气扩散理论分析了静风和重力沉降两种作用对尘粒在大气中扩散的影响；
In fact, the generally accepted theory now is that the production of rain depends upon the presence of dust particles in the air, which serve as nuclei about which the drops may form.
事实上，目前普遍公认的理论是：雨的形成依赖于空气中尘粒的存在，因为尘粒可作为晶核，使雨珠在其周围生成。
One theory is that it is caused by charge-inducing collisions in volcanic dust.
有推论说，由于火山尘埃带电物质相互撞击而诱发火山闪电。
This paper is intended to study the complex wave structure generated in gas and starch dust bulk while interaction of shock wave with starch dust bulk through experiment and theory analysis.
本文研究了激波与堆积粉尘相互作用后，气体和堆积粉尘内产生的复杂波系，主要从实验和理论两个方面对此进行了研究。
In this paper, the diffusion model and the theoretic calculation method of welding dust are given by gradient transportation theory and box model for outdoor atmospheric pollutants.
这里利用成熟的室外大气污染物扩散理论- 梯度输送理论和箱模式理论，提出焊接烟尘在室内的扩散模式和浓度分布的理论计算方法。
This paper presents a method of measuring the particle mean size and dust concentration by small angle near forward light scattering optics and the extinction theory.
本文综合前向小角光散理论及消光原理，提出一种测量粉尘平均粒径及粉尘浓度的光学方法。
An air curtain was designed according to the jet theory of fluid mechanics and the role and feature of air curtain to separate dust in a fully mechanized face.
根据流体力学射流理论，分析了空气幕在综采工作面隔离粉尘的作用，并根据综采工作面应用空气幕隔尘的特点，设计了空气幕。
The agglomeration of the charged dust particle is investigated by the method of electric-fluid mechanics and the transport theory of external force field.
应用电流体力学和外力场输运理论，分析了电收尘器中带电粉尘粒子的凝并现象。
A mathematical model of dust movement was derived from the gas-solid two-phase flow theory.
运用气固两相流动理论，建立粉尘运动的数学模型。
This paper introduces the theory of flammable dust fire and explosion accident, and describes prevention measures of dust explosion accidents and their fire fighting measures.
叙述了可燃粉尘火灾爆炸的原理，并详细描述了粉尘爆炸的预防和消防措施。
The paper systematically analyzes the problem of the dust pollution in pre-processing of wool and offers the control measures on theory and practice.
本文系统地分析了羊毛初加工过程中的粉尘污染情况，并从理论和工程实践二个方面提出了治理措施。
These research provided basis and technology support for theory perfect of wet dust collection .
这些研究为湿式除尘理论的完善提供了理论依据和技术支持。
The essay introduces the theory of reuse of dust-removing wastewater of coal based boiler and its applied technique which has been test-running in Changde Cigarettes Factory for one year.
本文介绍燃煤锅炉除尘废水的循环利用原理、应用技术及其在常德卷烟厂进行生产性试验一年来的结果。
According to the theory of solid physics from metal micro - structure and compression strength of tin-coating grain, a study is carried out in this essay on mechanism of parts stained with black dust.
根据固体物理中金属的微观结构、镀锡晶粒的抗压强度理论，分析了黑色粉末产生的机理。
Reliability theory was used to evaluate the reliability of a dust-control system applied in the blasting demolition of old Guangzhou Gymnasium Building.
在对广州市旧体育馆爆破拆除的抑尘系统进行可靠性评价时，应用了可靠性理论。
By the dust particle charged theory, the test study on the main technical performance of four types of corona polars is carried, the best polar matching form of horizontal ESP is approached.
运用粉尘粒子荷电原理，对四种电晕极的主要技术性能进行了试验研究，探讨了卧式电除尘器的最佳极配形式。
The idea of adjusting the cohesive force between polar plate and dust is put forwards from the perspective of dust polarization theory and polar plate electronic work function.
总结大量国外研究成果，指出影响除尘器效果的最主要因素是粉体的粘结力，提出了从粉体极化理论和极板电子逸出功角度考虑来调节极板和粉体间的粘结力的想法。
This article analyzes the electric dust catchers currently used in international market through explaining the classic theory that energy consumption is little when particles are separated.
从经典分离粒子所需能量很小的理论分析目前国内外采用的常规电除尘，其电场能耗还有98%以上的潜力可挖。
The paper introduced the working theory and the technology character of pulse-packs dust-catcher.
介绍了脉冲袋式除尘器的工作原理及技术特点。
In theory, lowering indoor humidity should lower concentrations of moisture-loving dust mites - a major trigger for asthma-related breathing problems.
理论上讲，降低室内湿度也就是降低空气水分含量，可以降低尘螨富集。这是一个重要的哮喘有关的呼吸问题。
Since dust particles can absorb radiation, the theory goes, the more polluted the city, the higher the temperature is artificially raised.
从理论上讲，既然尘粒子吸收辐射，那么，越是污染严重的城市，认为因素造成的气温上升就越大。
Since dust particles can absorb radiation, the theory goes, the more polluted the city, the higher the temperature is artificially raised.
从理论上讲，既然尘粒子吸收辐射，那么，越是污染严重的城市，认为因素造成的气温上升就越大。
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