A cordless phone also has no wires. It can be useful in the office or the factory. Imagine that you are working in an office and a customer calls you asking for some information.

• 无绳电话也没有导线。它在办公室或工厂里很有用。设想一下，你正在办公室里工作，这时一个客户打电话向你索取资料。