If I see you through the glass, the object is going on some trajectory, which has got both up and down and horizontal motion.

如果我透过窗户看你，物体在一些轨道上，有上升和下降，也有水平运动。

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Some movements involving primarily vertical or horizontal motions of the body as a whole, in which rotations can be ignored, can be studied using simple equations of linear motion in three dimensions.

有些运动主要涉及整体的垂直或水平运动，其中转动可以忽略，可以用三维线性运动的简单方程来研究。

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The load sway of crane is mainly generated by its horizontal motion.

起重机载荷摆振主要是由载荷水平运动引起的。

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"It's a horizontal motion of two pieces of the Earth's crust on either side of a vertical crack in the Earth,"

VOA: standard.2010.01.13

But if I see you through the glass, the object is going on some trajectory, which has got both up and down and horizontal motion.

但是如果我透过窗户看到你,这个物体沿着某个轨迹运动,既有上下,也有水平方向的运动

耶鲁公开课 - 基础物理课程节选

Previously, many buildings were made of concrete slabs and beams, which are less able to resist the horizontal motion of a powerful earthquake, experts say.

WSJ: After China Quake, Efforts Turn to Recovery