waiting call system的意思|示意

A typical Mac OS X application spends most of its time in the kevent system call, waiting for an event from the kernel to wake it up.

一个典型的Mac OS X应用程序的大部分时间在用在kevent系统调用上，等待从内核来的事件来唤醒它。

If each line — landline and cellular — has call waiting, a total of four callers could potentially be linked to the VTech system at once.

如果同时有固定电话来电和手机来电，那么总共有四个电话可以同时连接到VTech系统上。