At first glance, the time in system calls has gone down, but that's because the tracing was limited to a few interesting system calls with the -t option.
初看起来，系统调用耗费的时间下降了，但这是因为使用了-t选项将跟踪任务限制于一些有意义的系统调用。
The only thing new to your existing system is the hose coming down from the batch heater, the batch connect valve, and the “T” connector at the Hot Out valve to tie it all together.
整个热水系统中只有从批量加热热水器引水的软管、连接阀、以及接在止热阀（the HotOut valve）上用作贯通的三通是新添加的。
The only thing new to your existing system is the hose coming down from the batch heater, the batch connect valve, and the “T” connector at the Hot Out valve to tie it all together.
整个热水系统中只有从批量加热热水器引水的软管、连接阀、以及接在止热阀（the HotOut valve）上用作贯通的三通是新添加的。
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