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The transformation of Communicant Center to Audience Center is a basic trend of development of the mass communication in the West up to now. Since the beginning of 1980s, the seeds of Audience Center have appeared to some extent in mass communication in China; however, a complete Audience Center has not been found so far.

由传者中心向受众中心转移，是目前为止西方大众传播事业发展的基本趋势。80年代以来，我国大众传播事业亦出现一定程度上的受众中心之萌芽，然迄今为止，真正的受众中心远未确立。

The results showed that hexadecanoic acid diethanolamide and Daqing crude oil has favorable compatibleness, the binary system containing hexadecanoic acid diethanolamide(with the mass concentration of 0.2%) and HPAM(with the concentration of 1000mg/L)can produce ultralow interficial tensions 8.94×10~(-3mN/m against Daqing crude oil; the three compound combination system containing hexadecanoic acid diethanolamide(with the mass concentration of 0.2%) and HPAM(with the concentration of 1000mg/L)and Na_2CO_3(0.1%)can produce ultralow interficial tensions 6.34×10~(-4mN/m against Daqing crude oil.

其中，十六酸二乙醇酰胺与大庆四厂原油具有良好的配伍性，十六酸二乙醇酰胺0.2%、HPAM1000mg/L组成的二元驱油体系与大庆四厂原油可形成超低界面张力，最低可达到8.94×10~(-3)mN/m；十六酸二乙醇酰胺0.2%、HPAM1000mg/L、Na_2CO_31%组成的三元驱油体系与大庆四厂原油间的界面张力最低可达6.34×10~(-4)mN/m。

These three groups show the lowest willingness to pay for the fee of increasing the government's tax revenue. The groups of mass consumption and positive concernment show the highest willingness to pay fee for the use of education in ecological. The group of protecting environment shows the highest willingness to pay for the fee of interpreter's salary. The groups of protecting environment and positive concernment show the difference between the fees of ecological preservation. The groups of mass consumption and positive concernment show the difference fees of ecological education. The group of positive concernment shows the highest willingness to pay fee to the use of interpreter's salary, ecological preservation, increasing governments' tax revenue, and the use about ecological education.

研究结果发现此三集群游客均对於支付解服务费用作为增加政府税收之愿付价格为最低；「大众消费」及「热衷投入」集群均对於支付费用作为生态保育经费之愿付价格最高，「保护环境」集群则对於支付费用作为解员薪资之愿付价格最高；「保护环境」和「热衷投入」集群对於支付费用作为生态保育经费有显著性差；「大众消费」和「热衷投入」集群对於支付费用作为生态教育费用亦有显著性的差；「热衷投入」集群对於支付解服务费用作为解员之薪资、生态保育经费、政府税收和教育经费的愿付价格均是三集群中最高。

In view of geological records preserved from different regions of the world are not identical, it's suggested that, when correlating the Ordovician-Silurian boundary, at the global boundary stratotype section, the FAD of N. persculptus be selected as the biomark, the transgression event identical to the FAD of N. persculptus as the auxiliary physical mark and the mass extinction and chemical anomaly events respectively as the auxiliary biomark and chemomark. In some regions with few graptolite, the Ordovician-Silurian boundary should be indicated by the auxiliary marks, such as the transgression event, mass extinction or chemical anomaly event, with the other fossil such as conodont nearest to other geological events as the provincial biomark for correlation. In other regions with much stratigraphic hiatus originated from the regression, the Ordovician-Silurian boundary should be marked by the regression-transgression event nearly relevant to the N. persculptus Zone.

鉴于不同地区留下的地质记录不完全相同，奥陶/志留系界线对比方法不同：在界线层型剖面上，以N.persculptus的首现为生物标志，以与之基本一致的海侵事件为辅助的物理标志，以生物集群绝灭事件和化学异常事件为辅助的生物和化学标志；在笔石极不发育的地区，则以海侵事件、生物绝灭事件或化学异常事件为辅助标志，以与其相距最近、并且具有区域对比性的其它门类化石作为界线对比的生物标志；对于由于海退事件所造成地层缺失很多的地区，则以海退/海侵事件作为划分界线的物理标志，并以相映的海侵事件的开始作为奥陶/志留系的分界。

Based on the conservation principle of linear and angular momentum,the method derives the equations of the mass and mass center as well as inertia tensor of the new end-effector for the manipulator handling the unknown object.

1引言由于自由飞行空间机器人本体的质量随着载荷及燃料的消耗而发生变化，而目标的惯性参数往往是未知的，因此在运动控制时，必须进行参数辨识。

Energy balance能量平衡 Mass balance is straightforward, and refers to the principal of conservation of mass .

质量平衡是直截了当的，指的主要养护质量。

It greatly depends on Conservation of Mass to analyze the mass transportation of saturated liquid.

主要利用质量守恒定律分析饱和液体的传质过程。

Abstracdt:According to the analysis of conversion of mass in the process of nuclear reaction ,this essay establishes the dynamic conservation of mass as well .

先分析在核反应过程中，质量的转化情况，从而建立了质量动态守恒。

According to the principle of mass conservation, the kinetic model of SCFE is set up founded on differential extraction, and the mass transfer in SCFE is analyzed.

根据质量衡算原理，建立了基于微分床萃取的超临界流体萃取的动力学数学模型，从理论上分析了超临界流体萃取的传质过程。

Contemporaneously, we are seeking to develop new methodologies for accurate mass detection, as well as for disease diagnosis and in vivo, real-time study of therapeutic response base on mass spectrometry.

此外，本实验室也进行新生物质谱技术研发，未来也将致力於开发质谱仪与其他研究设备的连结介面，期能帮助鉴定疾病并监测治疗反应。

Hanna: That's over now, isn't it?

都结束了，对吗

You must be ill. You look so pale.

你一定是病了，你的脸色苍白。