The Richter Scale is a measure of ground motion.

里氏震级是测量地动的单位。

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In order to study earthquakes, scientists deploy seismometers to measure ground motion.

为研究地震，科学家采用地震仪来记录大地运动。

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Artificially generated ground motion history is an important tool for earthquake engineering research.

人工地面运动时程是工程抗震研究的重要工具。

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In this interferogram, the peak ground motion is almost 50cm of motion towards the satellite.

BBC: Christchurch quake mapped from space

Of course, companies like Research in Motion have broken ground by providing their customers with easy-to-use e-mail systems over handheld PDAs, such as the BlackBerry.

FORBES: Magazine Article

The Finnish handset maker reported a 1.4% drop in net income after losing ground to rivals Research in Motion (RIMM) and Apple in the lucrative smartphone market.

FORBES: Apple Buoyed Asian Tech Sector