交换设备使提交诸如通话保持、三方通话等通话控制功能成为可能,同时也提供对外设和服务(如声邮)的访问。
Switching equipment makes possible the delivery of call-control features such as call hold and three-way calling, while also providing access to peripheral equipment and services, such as voicemail.
如果你一定想要把手机置于耳朵上,要确保两只耳朵交替使用并且尽量控制通话时间越短越好。
If you must put the phone to your head, make sure to switch ears regularly and keep the conversation as short as possible.
在旅程期间,如果需要的话,乘客可以按下一个按钮和控制台的工作人员通话。
During the journey, a passenger can press a button to speak to the controller if necessary.
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