You can also use the -d switch to display each system call with a time delta, representing the elapsed time in seconds since the last event.
还可以使用- D开关显示每个系统调用的时间差，时间差表示自前一个事件以来流逝的秒数。
Cheng, Hong 1990. The Rural Commodities Market in the Yangzi Delta, 1920-1940: a Social and Economic Analysis. Ph. D. dissertation, Univ. of California, Los Angeles.
程洪(1990)：《长江三角洲的乡村商品市场，1920 - 1940，社会与经济的分析》，洛杉矶加利福尼亚大学博士论文。
The change of discharge and diversion ratio of the main junction is calculated by the 1-d model, and the influence of the engineering on the whole Pearl River Delta networks is analyzed.
同时利用一维数模计算工程后水面线及河网主要节点流量和分流比的变化，从整体的角度分析工程对整个珠江三角洲流域的影响。
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