This also makes some very active hams to select their station location... based on a GROUND CONDUCTIVITY, another important factor in station efficiency.

这也使的一些活跃的爱好者精心挑选他们电台的方位，要考虑地面导电性，这是电台是否能高效率的另外一个重要因素。

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This program focuses on the principles. technology. and maintenance of ground-based systems and equipments used to support aviation flight operations and space operations.

航空，航天，和雷达技术专业的学生学习地面系统的原理、技术和设备用于支持航空飞行操作和太空作业。

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A random synthesis procedure based on finite fault model is adopted for near field strong ground motion simulation, in this paper.

为了模拟近场强地震动，采用了基于有限断层模型的一种随机合成方法。

youdao

Tommy Franks, Central Command commander, was given essentially a 48-hour window to launch this attack at his discretion, based on the conditions he saw at the ground, when he felt the timing would be absolutely right.

CNN: Jamie McIntyre on the A-Day strikes

Given our dependence on the communication systems of our planet, both satellite- and ground-based, this is not simply a theoretical worry.

CNN: Four ways the Internet could go down