Most astronomers believe that the large concentration of mass at the galaxy's center is a black hole whose gravity is causing the gas to whirl.
大多数天文学家认为，星系中心的大量物质是一个黑洞，它的引力导致气体旋转。
A black hole is a concentration of mass great enough that the force of gravity prevents anything from escaping from it except through quantum tunneling behavior.
一个黑洞是物质浓缩到足够大的以致引力除了通过量子隧道行为之外阻止任何东西从它那里逃逸。
Study on relationship between extinction coefficient and mass concentration.
气溶胶消光系数与质量浓度的相关性研究。
The influence of different concentration of oxalic acid matrix on elemental inductively coupled plasma mass spectrometry was investigated.
研究了不同浓度乙二酸介质对元素电感耦合等离子体质谱行为的影响。
The better result of refining and dewaxing was achieved by using the ethanol solution with mass concentration of 70%.
本文采用质量浓度为70%的稀乙醇进行精制除蜡，效果较佳。
Haze - a mass concentration of surface imperfections, often giving a hazy appearance to the wafer.
雾度-晶圆片表面大量的缺陷，常常表现为晶圆片表面呈雾状。
Mass loading is negative correlation with extracellular polymers (EPS) concentration.
污泥负荷与胞外聚合物浓度呈负相关；
The particle mass concentration rises with the increase of particle diameter.
飞灰质量浓度随着颗粒粒径的增大而增加。
The mass concentration, water-soluble ions and elemental composition of fine particles were detected by the weighing method, ion chromatography, inductively coupled plasma chromatography separately.
用称重法、离子色谱法和电感耦合等离子质谱法分别测得细颗粒物的质量浓度、水溶性离子和元素组成。
The experimental results show that the mass concentration of cytokinin and the composition of the basic media have significant effects on the vitrification of plantlets of Aloe vera L. in vitro.
实验结果表明：细胞分裂素的质量浓度和基本培养基成分对离体培养中的美国芦荟组培苗的玻璃化现象有显著影响。
The hollow beam construction not only produce the stress concentration, reduce the effect of beam mass but also extended the bandwidth.
采用空心梁结构不仅能产生应力集中而且能减少梁的自身质量带来的影响，可以有效地展宽频带。
High mass concentration of lead induced adventitious roots.
高质量浓度铅诱导不定根产生。
The varying tendencies of mass loss rate, temperatures of each point, and CO concentration were all consistent with heat release rate.
质量损失速率、各点温度以及产物一氧化碳浓度变化曲线均与热释放速率曲线的变化趋势保持一致。
Thus the lack of such flare-ups around a compact concentration of mass is taken as evidence that the object is a black hole, with no surface onto which matter can be suddenly dumped.
因此密集度很高物体周围这类闪光的缺乏被获得物体是一个黑洞的证据，由于没有表面物质进入可能是突然倾卸之上。
The effect of atmospheric humidity on probing mass concentration of atmospheric dust by lidar is also discussed.
讨论了大气湿度对激光探测大气尘埃质量浓度的影响。
After the continuous mass concentration and flux conditions of the contaminant between two media were adopted, the bottom boundary condition of liner systems was treated.
采用两层介质之间污染物质量浓度连续和通量连续条件，处理衬里系统底端边界条件。
The difference between particle mass concentration and Bosch smoke number is indicated.
指出微粒的质量浓度与波许烟度的不同。
The principle, method and case history how to predict the average uranium mass concentration in lixivium of in-situ leaching are introduced and the existing problems are discussed.
介绍了矿床采区浸出液中平均铀质量浓度的预测原理、方法和实例，并讨论了存在的问题。
The mass concentration of oxygen in condensate is an important indicator to show the condensate quality, and it has great influence on thermal circulation of steam turbines.
凝结水中氧的质量浓度高低是显示凝结水水质的重要指标，对汽轮机的热力循环影响很大。
This paper analyses the change of PM_ (10) mass concentration at Shijingshan District in autumn, and finds that climate change affects PM_ (10) mass concentration greatly.
分析了北京市石景山区秋季PM _(10)质量浓度的变化特征，发现气候变化对PM _(10)质量浓度有很大影响。
Influence of different mass concentration of 2, 4-d on callus induction in maize inbred line 4112 from immature embryos with MS being used as basal culture medium was studied.
以玉米自交系4112的幼胚为外植体，以MS为基本培养基，研究了不同质量浓度的2,4 - D对愈伤组织诱导的影响。
The observational results indicated that NO2 pollution level increased year by year, the O3 mass concentration increased and maximum value appeared ahead in the year of 2006.
结果表明：南京市环境空气NO2污染逐年增加，2006年O3质量浓度增大并且最大值的出现时间提前。
The influence of different concentration of oxalic acid on elemental inductively coupled plasma mass spectrometry has been investigated.
研究了不同浓度下乙二酸对元素电感耦合等离子体质谱行为的影响。
Objective to investigate the relationship between the concentration of serum testosterone and bone mass (BMC) on the old men.
目的探索健康老年男性血清睾酮浓度与骨矿物质含量(BMC)的关系。
The principle and test method of using adsorptive stripping voltammetry to determine the mass concentration of trace iron in boiler water of thermal power generating units are described in this paper.
介绍了用吸附溶出伏安法测定火力发电机组锅炉用水中微量铁质量浓度的原理和试验方法，并对多组试验数据进行了分析和讨论，从而得出测试参数的最佳选取值。
The mass percent concentration of water in the MPC sample was 0.26%, which was determined by Karl Ficher titration.
卡尔·费休水分测定结果表明，MPC样品中含水量为0.26%(质量百分比浓度)。
The smoke performance was studied in smoke chamber. The detecting ability of IR thermal imaging is decreased with the smoke mass concentration increasing.
烟幕箱实验表明，红外热像的探测能力随红外烟幕质量浓度的增加而降低。
The paper describe on continuous measurement of the mass concentration of particulate matter emissions from coal fired power boiler.
本文介绍了燃煤电厂锅炉排放颗粒物质量浓度的连续测定。
A laser based technique is proposed which is able to measure and supervise the mass concentration and particle size of smoke and dust in emissions.
提出了能直接测量烟尘和粉尘排放浓度和粒径大小的激光监测技术，具有实时快速、非接触、在线、无需取样和连续测量的优点。
A laser based technique is proposed which is able to measure and supervise the mass concentration and particle size of smoke and dust in emissions.
提出了能直接测量烟尘和粉尘排放浓度和粒径大小的激光监测技术，具有实时快速、非接触、在线、无需取样和连续测量的优点。
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