In order to analyzing the vehicle-track coupling vibration character of infinite length track, a time-varying model of railway tangent track spatial vibration was presented.
针对无限长轨道上车辆轨道耦合振动响应特性，建立了铁路直线轨道结构空间振动模型。
I always pass that character layout takes more time and effort in order to achieve and English (the most widely used alphabetic writing country) the same visual layout.
汉字排版总是需要花更多的时间与精力，才能达到与英文(国内应用最多的拼音文字)排版同样的视觉效果。
In the paper, mainly discuss environmental hormone pollution character, kinds, and the harm to living things. At the same time, some measures are given in order to control the pollution.
主要论述了环境激素物质的污染特点、种类及对生物的危害，并提出了几点防治措施。
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