请问switch on the radio的意思

题目

请问switch on the radio的意思

答案

为减少嘶嘶声及噪音,使用DolBy B NR(降噪)开时录的磁带时,将FM MODE/DOLBY NR开关转至ON位置.Set the main switch selector to M (manual).Make sure that the mode dial is set to either multi exposure,or normal mode.
把主选择开关调至M(手动).保证模式盘调至多重曝光或者普通模式.He was feeling about in the dark for the electric light switch.
他在黑暗中摸索着找电灯开关.There is a switch on the wall for turning on the lights.
墙上有一开电灯的开关.