粒子

C If initially both particles are moving with given momenta, find a way to convert the problem into the case described in.

如果开始时两粒子都在运动，它们的动量已知，求一方法把问题转化为的情形，即一粒子初始是静止的。

From the previous research result it can be found that fine particle congregates most of the nocuous matter of aerosol.

以往的研究表明，细粒子富集了大气气溶胶中的大部分有害物质，它可以进入呼吸系统并沉积于肺泡，严重影响人类健康，并且是导致环境恶化的重要因素，因此，对细粒子的研究越来越得到人们的重视。

The stability of GA-PBCA-NP was also studied.ResultsDue to the agglomerationg of nanoparticles with no stabilizer,it was difficult to preparate.GA-PBCA-NP produced by the two methods both had spheric and smooth outer appearance,uniform distribution,nonadherence and stability.The diameter,ebeding ratio and drug loading in GA-PBCA-NP produced by emulsification polymerization and interfacial polymerization methods were 90～600 nm and 200 nm,60.49% and 73.87%,18.15% and 22.23%,respectively.

结果未添加稳定剂的纳米球表面粘连团聚现象严重，难以成球；乳化聚合法制备的GA-PBCA-NP在透射电镜下观察表面圆整光滑，粒子之间不团聚，不黏连，粒径范围在90～600 nm，包封率为60.49%，载药量为18.15%；界面缩聚法制得的纳米粒表面圆整光滑，粒子之间不团聚，不黏连，粒径大小均匀，都在200 nm左右，包封率为73.87%，载药量为22.23%，两种方法制备的稳定性都较好。

GA-PBCA-NP produced by the two methods both had spheric and smooth outer appearance,uniform distribution,nonadherence and stability.The diameter,ebeding ratio and drug loading in GA-PBCA-NP produced by emulsification polymerization and interfacial polymerization methods were 90～600 nm and 200 nm,60.49% and 73.87%,18.15% and 22.23%,respectively.ConclusionIt is important to add dextran 70 in preparation.

结果未添加稳定剂的纳米球表面粘连团聚现象严重，难以成球；乳化聚合法制备的GA-PBCA-NP在透射电镜下观察表面圆整光滑，粒子之间不团聚，不黏连，粒径范围在90～600 nm，包封率为60.49%，载药量为18.15%；界面缩聚法制得的纳米粒表面圆整光滑，粒子之间不团聚，不黏连，粒径大小均匀，都在200 nm左右，包封率为73.87%，载药量为22.23%，两种方法制备的稳定性都较好。

This paper explains the difference and relation of the three kinds ensembles in statistical mechanics by analyzing fluctuation between the numble of articles and energy and the relation in numble of articles and energy between average and maxium.

本文从粒子数和能量的涨落和粒子数和能量的平均值与极大值之间的关系，说明统计物理中三种系综之间的区别与联系。

Different conditions affecting the diameter and magnetism of synthesized composite particles were discussed such as tetraethyl orthosilicate concentration,Fe_3O_4:TEOS mole ratio,reaction temperature,stirring rate,etc.

考察了不同的制备条件对复合粒子的粒径和磁性能的影响，并借助不同的分析测试手段对复合粒子的性能进行表征。

First,This pape introduces the principle of particle system and makes a further study on the basic model of firework particle system and the principle of letting off fireworks.

本文首先阐述了粒子系统的基本原理，对烟花粒子系统的基本模型和燃放原理进行了分析。

The properties of the composite particled were characterized by TEM and FTIR.In addition,the thermal properties of the composite material were investigated by thermogravimetric analysis.

采用透射电子显微镜和红外光谱仪对复合粒子的性质进行了表征，利用热重分析仪器对复合粒子的耐热性能进行了研究。

This indicates that PEGA prevents the growth of the CaCO_3 particles, while PEGA-PMAA promotes the growth of the CaCO_3 particles.

这说明PEGA在CaCO_3粒子生长过程中起了阻碍作用，而双亲水的PEGA-PMAA则促进了CaCO_3粒子的生长。

Coli. Transmission electron microscopy was used to evaluate the cell morphology of both the normal and the treated E. coli. The observation with TEM suggested that silver nanoparticles lead to the formation of "pits" in cell wall of the bacteria, and silver nanoparticles could enter into periplasm through the pits and destroyed the cell membrane.

采用透射电镜观察了经纳米银粒子处理过的大肠杆菌细胞形态变化过程，结果显示纳米银粒子先在细胞壁上产生小的孔洞，通过这些孔洞进入周质空间，导致细胞膜成分渗漏和破坏细胞膜，进而进入细胞内部。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。