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。
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.
它们并非经常发生，大约只有一年一次，因为太阳，月亮的轨道相互倾斜，它们很少能排成一条直线。
They don't happen often-only about once a year-since the tilted orbits of the sun, moon, and Earth make their alignment rare.
锭子运动的轨道由直线和曲线两部分交替组成。
Track of spindle consists of straight line and curve line in turn.
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