由于射频信号可能会干扰某些电子医疗装置和导航系统，在医院里和飞机上通常禁止使用移动电话。
Mobile phones are often prohibited in hospitals and on airplanes, as the radiofrequency signals may interfere with certain electro-medical devices and navigation systems.
这些黄色框和黑色框的装置，的箭头标志，这些箭头信号反馈回，自动导航装置，所以飞机可以，稳定航线。
And the arrow signals that come from the bearings of the yellow housing and the black housing, those arrow signals are fed back to the automatic pilot and so the plane will stay on course.
一种向飞机发送特殊导航信号的无线电传送装置。
A radio transmitter that emits a characteristic guidance signal for aircraft.
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