Third, high tariff and threatened by the challenge from the terrestrial system;

三是通话费用高，各地价格差别大，且受到地面系统的有力挑战；

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This terrestrial digital broadcast system means that more people will be able to use the service.

这种地面数字电视广播系统使得更多人能够使用这项新服务。

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Most models of planets assume that they are similar to the terrestrial planets in our own Solar System, with about half as much carbon as oxygen in the atmosphere.

而多数行星模型均假设它们和我们太阳系的类地行星相似，即在大气中碳含量是氧含量的一半左右。

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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

The process, which will eventually affect all TV viewers in the UK, involves the conversion of the country's terrestrial television system to digital.

BBC: Dundee becomes Scotland's first 'digital city'

Dr. THOMMES: We had have ordered a few percent of systems that where the giant planets at least resemble the architecture in our own system, as to whether we would then have terrestrial planets in the habitable zone, the chances of that actually aren't too bad, because the terrestrial planets, we think, they kind of sprout like mushrooms pretty much anywhere.

NPR: What Makes Our Solar System Special?