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Antenna
天線
An antenna is used for radio, television, radar and so on.
天線用于廣播、電視、雷達等等。
It works in air and under the water.
它適用于空中和水下。
Antennas send signals and receive signals.
天線發(fā)送和接收信號。
Antennas make those signals stronger, so people can listen to the radio better and watch TV more clearly.
天線使那些信號變得更強，因此人們能更好地聽廣播、更清晰地看電視。
Thomas Edison and Heinrich Hertz used antennas and developed them very well in the 1800s.
十九世紀，托馬斯·愛迪生和海因里?！ず掌澥褂锰炀€并很好地發(fā)展了它們。
