Your first tonal sequence should be simple: two low tones with 0.5 seconds between them for a "beep beep."
第一个音调序列应当很简单：两声低音哔哔，间隔为0.5秒。
The horn on the bus goes Beep, beep, beep;
公车上的喇叭嘟嘟响， 嘟嘟响， 嘟嘟响。
嘀嘀嘀，我是一名小司机。
The sounds should be more sophisticated than a steady buzzing or musical sound, the jarring beep-beep made by reversing trucks or the jangle of ice-cream-van bells.
Roussarie说，相比持续的嗡嗡声或音乐声、卡车倒车发出的嘟嘟声或流动雪糕车的刺耳声，这种声音应更为复杂。
The sounds should be more sophisticated than a steady buzzing or musical sound, the jarring beep-beep made by reversing trucks or the jangle of ice-cream-van bells.
Roussarie说，相比持续的嗡嗡声或音乐声、卡车倒车发出的嘟嘟声或流动雪糕车的刺耳声，这种声音应更为复杂。
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