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| Zhang Aiguo (right) and a friend fly a drone in a field in Changsha, Central 皇冠体育app's Hunan province, March 20. The Wall Street Journal reported in May 2013 that drones are the latest development in the field of precision agriculture in the U.S, and it uses technology such as global positioning systems, sensors and iPads to more accurately monitor fields. [Photo/Xinhua] |
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