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.
北京时间周二下午3点10分，我国在西北的酒泉卫星发射中心成功地发射了一颗测图卫星“天绘一号”。
China successfully launched a mapping satellite, "mapping satellite - I," from the northwestern Jiuquan satellite launch Center at 3:10 p.m. (Beijing time) Tuesday.
关键是，步骤号要与用例中的步骤号对应起来，使图的读者能够清楚地了解步骤的大体思想。
What is critical is that the step Numbers correspond to those in the use case and the general idea of the step is apparent to the reader of the diagram.
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