switch /switʃ/ I. n. ［c］ 开关，电闸： switch board 配电盘；an electric switch电开关  2.转换：After several switches, they found themselves on the right road. 转了几处，他们发现路还是走对了。 ‖II. vt. & vi.改变，转移： switch sides 改变立场 He is always switching jobs. 他总是换工作。［考句］At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly switched to another subject. 演讲者开始讲的是该国的污染问题，但中途突然转换了话题。switch off 关上(电灯，电视等)切断(电源): Switch the machine off, please. 请关上机器。 switch on 开(电灯，电源等)：Switch on the radio. 打开收音机。