关于中立区和侵犯中立区，中立区指的是球的前后竖直平面。
The Neutral Zone is the space between the forward and backward points of the ball (planes).
城墙很容易被雷达探测到，因为城墙的竖直光滑的平面提供了一个反射雷达波束的突出表面。
The wall is easily detected from space by radar because its steep, smooth sides provide a prominent surface for reflection of the radar beam.
为了研究该机床静刚度的变化情况，计算同一水平面或竖直面内的静刚度变化率。
In order to study the variation of the stiffness, the variance ratio of the stiffness within the same horizontal or vertical plane is computed.
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