Like many other developers with a history in telecom, I learned that when you build a telephone switch, regulations say it must provide dial tone in 40ms, a difficult requirement to achieve.

像许多常年混迹于电信行业中的开发人员一样，我所学习到的是，若实现一个电话交换，则一定要在40毫秒内发出拨号音，这是一个难以实现的需求。

youdao

We have air conditioning, heating, a telephone with international direct dial, a color TV set, ect.

有空调、气，由国际直拨电话，一台彩色电视机等。

youdao

Consumers dial the telephone hotline of this website which starts with 400 and then this website notifies restaurants of reservation information. Fees are charged according to the number of diners.

让消费者拨打本网站400热线电话，本网站再向餐厅告知订餐信息，按照用餐人数向餐厅收费。

youdao

Modeled after the information and e-commerce transactions available on the Web, the latest in information technology starts with a telephone number that you'll be able to dial to reach a computer that hears and guides your requests and answers them using voice-recognition technology.

CNN: Graphic