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。
Don't get things mixed up, just the z component of the force becomes Gm triple integral of delta cos phi sine phi d rho d phi d theta.
不要搞混，只是力的z分量罢了,它是Gm∫∫∫δcosφsinφdρdφdθ
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。
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