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

The Delta handheld's easy-to-read LCD display makes it simple to switch among five different training configurations.

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