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；

youdao

Wetlands are formed by the interaction between terrestrial system and aquatic system.

湿地是由陆地系统和水体系统相互作用形成的自然综合体。

youdao

Impulsive solar activities are very important sources of disturbances in the solar-terrestrial system.

爆发型太阳活动是日地系统中重要的扰动源。

youdao

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'

Panasonic showed off a system that can pipe terrestrial digital broadcasts into trains, coupled with a wireless system to allow commuters to hear a broadcast's audio via headsets without disturbing other passengers (hey, some of us like to work, read -- or sleep -- on the train).

ENGADGET: Japan's NTV shows future of mobile TV

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