Farmyard robots can cut down chemical pollution.
? Many of them use chemicals to kill weeds（杂草）. The trouble is, these weedkillers also kill wildlife, pollute rivers and are bad for the fields. . This kind of robot can cut weedkiller use by 90%. The robot is really smart because it only kills weeds but not crops（庄稼）.
Several cameras are built into the robot. The cameras facing the ground take photos to help the robot "see" the plants it passes.
The robot compares each photo to a library of plant photos to decide on which plants are weeds.
Robot arms move into position to give a small dose（剂量）of weedkiller on the weeds.
The robot is energy-friendly. .
How the robot will develop
The scientists do not want to just stop at the achievement they have made. . The improved model of robots will exactly discover weeds and dig them out instead of weed killers.
Robots could be programmed to leave some harmless weeds in the fields to support wildlife living there.
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A. But scientists have created a farmyard robot B. It is powered by the energy from the sun C. Where the robot is used D. They're working on the new designs to improve the model E. How the robot works F. Why do farmers choose the robot to work in their fields G. How do farmers usually kill weeds in the fields |
