这将作为前台进程启动MongoDB数据库服务器。
This will start the MongoDB database server as a foreground process.
可见进程被认为是非常重要的进程，除非无法维持所有前台进程同时运行了，它们是不会被终止的。
A visible process is considered extremely important and will not be killed unless doing so is required to keep all foreground processes running.
一个可见进程只有在保持所有前台进程运行的时候才会被认为是很重要的并且不会被杀死。
A visible process is considered extremely important and will not be killed unless doing so is required to keep all foreground processes running.
在测试阶段，将触发器监控器作为前台进程运行更方便，因为所有诊断消息将在命令会话窗口中可见。
It is much more convenient during the testing phase to run the trigger monitor as a foreground process because all of the diagnostic messages will be visible in the command session window.
一般而言，任何时刻前台进程都是为数不多的，只有作为最后的策略——当内存不足以维持它们同时运行时——才会被终止。
Generally, only a few foreground processes exist at any given time. They are killed only as a last resort-if memory is so low that they cannot all continue to run.
这些进程对用户体验没有直接的影响，系统可能在任意时间终止它们，以回收内存供前台进程、可见进程及服务进程使用。
These processes have no direct impact on the user experience, and the system can kill them at any time to reclaim memory for a foreground, visible, or service process.
通常，设备这时候已经到了内存分页状态(memory paging state)的地步，终止一些前台进程是为了保证用户界面的及时响应。
Generally, at that point, the device has reached a memory paging state, so killing some foreground processes is required to keep the user interface responsive.
应用程序进程是用户可见或前台活动通常会被给予高优先级，确保相机获取和使用更加可靠。
Application processes with user-visible or foreground activities are generally given a higher-priority, making camera resource acquisition and use more dependable.
应用程序进程是用户可见或前台活动通常会被给予高优先级，确保相机获取和使用更加可靠。
Application processes with user-visible or foreground activities are generally given a higher-priority, making camera resource acquisition and use more dependable.
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