The length of the arrow shows the approximate speed in a direction perpendicular to the line of sight.
图中的箭头长度近似的表示在垂直于我们的视线的面上，这三个星系团的速度。
Taking miss distance of the interceptor along line-of-sight Z direction as performance index, start-up time of the motor w.
以拦截弹在视线系z向上的脱靶量达到最大值作为性能指标，对机动发动机开启时刻进行优化确定。
The officers usually position themselves on overhead bridges that cross a major road or expressway with a clear line of sight in either direction.
警察通常位置对架空桥跨自己一条主要道路或高速公路有一个清楚的视线从两个方向。
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