How to switch a call to one service between many services?
如何在多个服务之中将调用切换到某个服务？
Step four: the write system call returns, creating our fourth context switch.
步骤四：系统调用返回，导致了第4次上下文切换。
The send system call returns, creating the fourth context switch.
send系统调用返回，结果导致了第四次的上下文切换。
On the panel 108vu, push the RESET pushbutton switch to stop the mechanic call horn.
在108vu面板上，按压reset按钮电门以停止机械员呼叫喇叭声。
Freely switch between Phone call, Bluetooth Intercom, Music.
电话通话之间自由切换，蓝牙对讲，音乐。
Freely switch between Phone call, Bluetooth Intercom, Music.
电话通话之间自由切换，蓝牙对讲，音乐。
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