图1说明了此示例系统中的用例，图2的活动图表中介绍了其中用例的执行顺序。
Figure 1 illustrates the use cases in this sample system, and the sequence in which the use cases are executed is shown in the activity diagram in Figure 2.
论文记录了第71届国际图联大会的概况，并对大会的学术特点以及中国代表团在大会的活动作了较全面的介绍。
This paper records the survey of "71st IFLA General Conference and Council" and comprehensively introduces the science feature of the Conference and the activities of Chinese mission there.
论文记录了第71届国际图联大会的概况，并对大会的学术特点以及中国代表团在大会的活动作了较全面的介绍。
This paper records the survey of "71st IFLA General Conference and Council" and comprehensively introduces the science feature of the Conference and the activities of Chinese mission there.
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