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.
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。
The compiler has no way of telling if you have the right integers going into the method call in the correct order since they are just three integers.
编译器无法知道在调用方法时参数传递顺序是否正确，因为它们只是三个整数而已。
I didn't see him again for years, but I'd call him every six months or so and set up a three-way conference call with a translator.
几年没见到他了，但我大约半年给他打个电话，请一个翻译，和他开三边会议。
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