Television broadcasts are (1) to an area that is within the (2) of the sending station or its relay (中转站). (3) television relays are often placed on hills and mountains so that they can (4) a wider region, they still can not cover more land than one from the hilltop (5) a clear day.
However, the rays also go out into the atmosphere, (6) there is a relay station on a satellite that (7) around the earth, it can send the pictures to any point on the earth from which the satellite is (8) . Three satellites (9) turning around over the equator (赤道) send any television program to any part of the earth. (10) makes it possible for world (11) of newspapers to give the news in all countries at the same time. (12) it may be possible for a subscriber (户) to a televised newspaper to (13) a button and see a newspaper page (14) his television screen. He could also decide when he wants the page (15) , (16) , by dialing different numbers such as (17) on a telephone dial, he could choose the language or the edition of the paper he wants to read.
It seems strange to think that, even today, methods of the (18) are not entirely useless. For example, sometimes (19) agencies which use radio also use pigeons to (20) messages between offices in large cities because the pigeons are not bothered by traffic problems.