system clock

例句：

1. 1. The system clock is set to the current time automatically.
   系统时钟被设置为自动设置当前时间。
2. 2. The system clock is crucial for maintaining accurate timekeeping in a computer system.
   系统时钟对于在计算机系统中保持准确的时间至关重要。
3. 3. The system clock was reset after the power outage.
   电力中断后，系统时钟被重置了。