Most antennas are made in the shape of a dish to collect and reflect the radio waves to the sub reflector, in the same way as a curved mirror focuses visible light to one point.
大多数天线被制成碟形，用以收集和反射无线电波至亚反射器，就像曲面镜将可见光聚焦于一点一样。
Audiovisual records -film, video, radio and recorded sound material -mirror human creativity and the living fabric of our cultures.
音像制品—电影、录像、广播、录音材料—折射出人类的创造力，是活的人类文化织体。
Audiovisual records - film, video, radio and recorded sound material - mirror human creativity and the living fabric of our cultures.
音像制品—电影、录像、广播、录音材料—折射出人类的创造力，是活的人类文化织体。
Audiovisual records - film, video, radio and recorded sound material - mirror human creativity and the living fabric of our cultures.
音像制品—电影、录像、广播、录音材料—折射出人类的创造力，是活的人类文化织体。
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