Fill in the blank with one word. The first letter is given already. 在横线上填上合适的单子，单词首字母已给出。注意所填单词前后两个句子之间的联系。(答案请给出完整单词，注意拼写和大小写) The word “robot” is used to refer to a wide range of machines, the commion feature of which is that they are all capable of movement and can be used to perform physical tasks. Robots take on many different forms, ranging from ones that take on the human form and way of moving to ones whose appearance is dictated by the function they are to perform. Robots can be g generally as mobile robots, industrial robots, and robots which can fit themselves to the task at hand.