His entrance was announced by a buzzer connected to the door.他刚一进去，与门相连的门铃便嗡嗡作响。The buzzer suddenly responded in a long blast of sound.蜂鸣器突然相应地发出了一声响亮的长鸣。The buzzer went off at eight o'clock.蜂鸣器在8点钟时响了....
There has always been a difference between community radio and commercial radio.社区广播电台和商业广播电台一直是有区别的。Attacks were reported on police, vehicles and commercial premises.据报道，警察、车辆和商业经营场所均遭到袭击。British Rail has indeed become ...