文中用基于图段的方法计算欧拉数，并对该算法的时空复杂度进行分析比较。
In this paper, an approach to compute Euler number based on foreground run is formulated.
柱状图会显示一周中繁忙和平静的时间段。
A bar graph will show you the busy and quiet times during the week.
靠近地球的9号探测器和其他俄罗斯着陆器所看到的岩石图，暗示了一段痛苦的火山历史，这一点在上世纪90年代初得到了美国麦哲伦轨道飞行器的证实。
The rocky views glimpsed by the Nearer Nine and other Russian landers suggested a tortured volcanic history that was confirmed in the early 1990s by the American Magellan orbiter.
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