序列图是如此好用的理由是，因为它按照交互发生的时间顺序，显示了系统中对象间的交互逻辑。
The reason the sequence diagram is so useful is because it shows the interaction logic between the objects in the system in the time order that the interactions take place.
flow选项创建一个纯文本跟踪输出文件，在这个文件中，跟踪记录是按进程(by process)以及时间顺序排序的。它所创建的实际上是一个控制流图。
The flow option creates a plain text trace output file in which the trace records are ordered chronologically by process; it creates what is essentially a control flow diagram.
数值模拟了不同海拔高度、不同来流速度、不同弹丸头部半径、不同半锥角条件下弹丸的烧蚀情况，给出了弹丸按时间顺序排列的烧蚀外形图。
At the conditions of different altitudes, velocity, shapes, the deformation of projectile are numerical simulated. The ablation profiles of the projectile are given in chronological orders.
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