In my perspective, communication is bi-directional, just like buying and selling.

在我的角度来讲，沟通是双向的，就像买和卖。

youdao

DVOR (Doppler VHF omni-directional Range) is one of the equipments most commonly used in today's civil aviation communications and navigation. It provides the perspective information for the aircraft.

（多普勒甚高频全向信标）是当今民航最为常用的通信导航设备之一，可以给民航飞行器提供角度信息。

youdao