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Surveillance means watching someone or something. It may be secret, and many methods are used including telephone tapping to listen to the person's calls and putting an electronic listening device, a bug, into a room.
Governments and the military have built large facilities designed to listen in to communications between other governments and military groups. For example the U.S. has a large base at Pine Gap near Alice Springs, Australia, which listens to communication signals from all over the world.
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