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地文导航
trn terrestrial radio navigation 地面无线电导航
terrestrial radio navigation system 陆基无线电导航系统
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These days satellites are used far more widely for communications, terrestrial navigation, crop monitoring and much more.
如今卫星被更广泛的应用在通讯，陆地导航，农作物监测等等。
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Each probe can pick up GPS signals and signals from eLoran, an enhanced version of Loran, the ground-based terrestrial radio-navigation system first used by the American and British navies during the second world war.
ECONOMIST: GPS jamming
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