For example, all a VFR pilot has to do to enter Class C airspace is establish two-way radio contact with ATC.
例如，VFR 飞行员进入 C 类空域所要做的就是与空中交通管制建立双向无线电联系。
2
The pilot began to talk him down by giving instructions over the radio.
飞行员开始通过无线电发出指令，引导他安全着陆。
《柯林斯英汉双解大词典》
3
Another pilot on the ground at the heliport saw the plane approaching and tried to radio an alert to the helicopter above. But the warning was either not heard, or failed to get through in time.