The faint arrows, similar to the directional markings on a tactical map, are one of the rare carry-overs from his military world.
微小的箭头类似于战术地图上的方向标记，是他的军事世界中罕见的遗留物之一。
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By looking at how the faint light from galaxies behind the cluster they were studying was distorted by that cluster, Dr Jee and his team created a map of the distribution of its mass.