将离散单元法(DEM)拓展到三维流固两相流的数值模拟中，提出了颗粒群轨道柔性模型。
Let the discrete element method (DEM) be developed into the numerical simulation of 3d fluid-solid two-phased flows, the trajectory flexible model of particle group has been put forward.
为解决工程应用中三维流固两相流动力学建模的难题，提出了基于离散单元法(dem)的颗粒群轨道柔性模型。
For dynamics modeling of 3d fluid-solids two-phase flows in engineering problem it was brought forward of particles trajectory flexible model based on the discrete element method (DEM).
一名铁路部发言人称，由于一大群年轻人在轨道上来回穿越，杜伊斯堡的一些主要车站已关闭。
The main railway station in Duisburg was closed because of the number of young people wandering across the tracks, a railway spokesman said.
其它的计数问题引导我们去研究置换群的轨道。
Other enumeration problems lead us to the study of orbits of permutation groups.
地外文明搜索协会Seti的科学家们使用火星轨道勘测器上的红外观测仪器对尼利•福萨岩石群进行了研究。
Scientists from the Search for Extraterrestrial Intelligence Institute (Seti) used infrared light from an instrument on the Mars Reconnaissance Orbiter to study the Nili Fossae rocks.
这里可以看见它的已知3个卫星：冥卫1，冥卫2，和冥卫3。 包括冥王星在内的一群物体，在海王星的凯伯带（数十亿颗在海王星轨道之外绕行的小型冰体构成的碟形带）之上，围绕着太阳的作盘形轨道运行。
Seen here with its three known moons, Charon, Nix, and Hydra, Pluto is a member of a group of objects that orbit in a disklike zone beyond the orbit of Neptune called the Kuiper belt.
星期六，一群少年来到该市东部的火车轨道上，在疾驰而来的火车前玩自拍。
A group of teenagers went to the railway tracks in the east of the city on Saturday to take pictures in front of oncoming trains.
因而对我国都市群内城际轨道交通系统进行研究，具有十分重要的理论意义和实践意义。
Therefore, it is need to study the inter-city rail system, and has important theoretical and practical significance.
然而，即使对于本原群，其次轨道的决定也是一个非常困难的问题，它依赖与人们对抽象群本身结构的了解和一些组合方法的应用。
However, such a problem is very difficult in general, even for primitive groups and it depends heavily on the understanding of abstract groups and the application of combinatorial tools as well.
其中一个担忧是一群微型卫星就意味着太空垃圾大量增加，但是，如果在近地轨道运行，这些卫星就会烧掉或者一年后重新进入轨道。
One worry is that constellations of nanosats will mean a big increase in space junk; but, operating in low-Earth orbit, they burn up on re-entry after a year or so.
大都市群有着大范围的电力照明和特别的道路布局，因此在卫星轨道的高度上都能辨认。
Large urban areas are recognizable from orbit due to extensive electric lighting and distinct street patterns.
如果切换轨道，牺牲的就不只是一个或一群小孩了，而是整车的乘客呢？
If you switch the railway, will it be the case that all of the passengers would die instead of several kids?
拟建的上海市轨道交通11号线区间盾构隧道近距离下穿交大海洋重点工程实验室群桩基础。
The interval shield tunnel of Urban transit line 11 in Shanghai is situated closely under the group piles of the National Key Laboratory for Ocean Engineering of Shanghai Jiaotong University.
我们的理念是运用世界一流的技术为铁路轨道提供维修设计，制造和服务，因此我们在世界各地拥有了基于超过125条铁路的全球客户群。
Our philosophy of applying world class technology to railway track maintenance design, manufacturing, and service has led to a global customer base of more than 125 railways throughout the world.
我们的理念是运用世界一流的技术为铁路轨道提供维修设计，制造和服务，因此我们在世界各地拥有了基于超过125条铁路的全球客户群。
Our philosophy of applying world class technology to railway track maintenance design, manufacturing, and service has led to a global customer base of more than 125 railways throughout the world.
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