问答题Robot
 Even before the first robot was built, the subject of robotics was controversial. The word "robot" was coined in 1921 by a Czech playwright who wrote about a colony of machines endowed with artificial intelligence that eventually turned against their human creators. Although that account was fictional, the first industrial robots were in use by the early 1960s. Today, we continue to be intrigued by robots and their potential for both good and evil.
 Basically, a robot is any machine that performs work or other actions normally done by humans. Most robots are used in factories to make products such as cars and electronics. Others are used to explore underwater, in volcanoes and even on other planets.
 Robots consist of three main components: a brain, which is usually a computer; actuators and mechanical parts such as motors, wheels and gears; and sensors for detecting images, sound, temperature, motion and light. With these basic components, robots can interact with their environment and perform the tasks they are designed to carry out.
 The advantages are obviousrobots can do things humans just don’t want to do, and they are usually more cost effective. Robots can also do things more precisely than humans and allow progress in medical science and other useful advances.
 But, as with any machine, a robot can break down and even cause disaster. There’s also the possibility that wicked people will use robots for evil purposes. Yet this is also true with other forms of technology such as weapons and biological material.
 Robots will probably be used even more in the future. They will continue to do tasks where danger, repetition, cost or the need for precision prevents humans from performing. As to whether they will be used for good or evil, that depends on the nature of the humans who create them.