45.the motor carbon brush of radar antenna has been worn seriously due to long time service . it can not touch really.
雷达天线电机碳刷由于长时间使用磨损严重，接触不良。
Radar antenna
原声例句
航海英语听力
TED-Ed（视频版）
In aviation, radar antennas launch pulses of radio or microwaves at planes to learn their locations by timing how long the beams take to bounce back.
在航空领域，雷达天线在飞机上发射无线电或微波脉冲，通过计算波束弹回多长时间来了解它们的位置。
三体 I
In reality, everyone with a little common sense knew it wasn't a radar antenna: Even though its orientation changed every day, the antenna never moved in a continuous manner.
事实上，稍有常识的人都知道这不是雷达天线：尽管它的方向每天都在变化，但天线从来没有连续移动过。
英语百科
Radar engineering details
Radar engineering details are technical details pertaining to the components of a radar and their ability to detect the return energy from moving scatterers — determining an object's position or obstruction in the environment. This includes field of view in terms of solid angle and maximum unambiguous range and velocity, as well as angular, range and velocity resolution. Radar sensors are classified by application, architecture, radar mode, platform, and propagation window.
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