Today, robots are manufactured and used is very popular. so why is it so popular again?. First, it has the very high accuracy and almost no errors. the second is that it has a superior productivity. third, it can replace humans in dangerous jobs. However, the robot also has disadvantages. It always needs the controls or presets. Moreover, it is not able to handle unexpected situations. In addition, the companies will spend much of investment costs and repair robot. but in the not so distant future, the robot is improved
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