A robot is a machine which is designed to do the work of

a human being.It is usually controlled by a computer.Onceit has

been given a set of things to do，it will do the job on its own.

Robots can paint cars，salvage (抢救) nuclear fuel and even

assist in brain surgery (外科手术), but they're still pretty dumb.

Today robots can recognize forms and shapes and measure

distance and so on.Many robots have one or two of these

abilities to some degree, but creating a competent (有能力的)

robot that combines most or all of them has been difficult.

　　Current (流行的) robots have advanced sensory systems

that process information and appear to function as if they had

brains.Their "brain" is actually a form of computerized artificial

intelligence (AI). AI allows a robot to perceive conditions

and decide upon a course of action based on those conditions.

　　A robot can include any of the following parts：

　　effectors - "arms" "legs" "hands" "feet"

　　sensors - parts that act like senses and can detect (侦测)

　　objects or things like heat and light and change the object

　　information into symbols that computers understand

　　computer - the brain that contains instructions called

　　algorithms (规则系统) to control the robot

　　equipment - this includes tools and mechanical fixtures

　　(机械手臂)