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。

youdao

I made the switch by gradually reducing my meat intake during summer last year so that by the time I moved to uni, I didn't have any problems cutting it out.

去年夏天我渐渐的减少肉类的进食因此到大学报到时，我已经没有任何问题的戒掉了。

youdao

dxdy Last time I told you if we have dx dy we could switch it to r dr d theta.

上一次课提到，如果给出,我们可以把它转换为rdrdθ

youdao