Nonreusable rockets launched from the ground based on designs from the 1940s are not the answer.

20世纪40年代地面发射的那种一次性火箭不是我们要的答案。

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Astrophysicists working with ground-based detectors at the South Pole and balloon-borne instruments are closing in on such structures, and may report their findings soon.

天体物理学家利用南极陆基探测器和球载仪器工作，正在对这些云系进行观测，也许不久会报告他们的观测结果。

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General Dynamics, under contract to Lockheed Martin, has overall responsibility for the ground-based segment of the MUOS system.

通用动力公司将MUOS系统的地基部分分包给洛克希德马丁公司，现已全部完成。

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After all,they observe the skies with huge ground-based and costly space telescopes.

VOA: special.2009.08.25

U.S.Defense officials say the new plan would include interceptor missiles deployed on U.S.Navy ships in the North Sea and Mediterranean, in addition to ground-based weapons.

VOA: standard.2009.10.21

He says this is one reason he recommended scrapping plans to build a sophisticated radar system in the Czech Republic and installing ground-based interceptors in Poland.

VOA: standard.2009.09.17

The actual number of troops, the timing, has to be determined by commanders on the ground based upon the conditions on the ground.

NPR: Debate on Iraq Timetable Moves to Senate

Such systems include all phases of the Phased Adaptive Approach to missile defenses in Europe, the modernization of the Ground-based Midcourse Defense system, and the continued development of the two-stage Ground-Based Interceptor as a technological and strategic hedge.

CENTERFORSECURITYPOLICY: Center for Security Policy | Mapping a National Security Failure: Ratification of the New START Treaty | Page: 14

Just one year ago, the Bush administration announced it would keep the ground-based LORAN system operational to serve as a backup for the satellite-based global positioning systems, which are becoming ubiquitous in cars, planes and ships.

CNN: Navigation system, aid to farmers among budget cuts