When people talk about drones（无人机，遥控飞机）, Amazon's delivery（投递，递送） drones often lead the discussion（主导谈话，聊天的主角，重头）.However, drones, or unmanned aerial（航空的，航天的） vehicles（车辆，运行器械，飞行装置）, were used long before Jeff announced his plan.Originally（原本） drones were used for military（军事的） and intelligence applications（智能化应用） like spying（间谍） and bombing.Today more and more civilian drones are being used in surprising（令人感到惊讶的，意外的） areas（区域，领域）.

Farming
Farmers are using drones to monitor fields, increase yields, and save money.Drones with digital cameras help farmars identify problem ares for closer inspection（近距离观察）, but drones with infrared light（红外线） cameras can inspect crop health by detecting photosynthetic（光合作用） in various plants

3D Mapping
Small, lightweight drones fly over（飞跃） landscapes and take thousands of digital images.Then software pieces them（把他们切片） into 3D maps.