When all was ready a signal was given, and they began their music.
当一切准备就绪，信号发出，它们开始鸣叫。
The alarm signal is no longer a single before beeps instead of the beautiful music.
而报警信号不再是以前单一的嘟嘟声，代替的是优美的音乐。
The alarm signal is no longer a single before beeps instead of the beautiful music.
而报警信号不再是以前单一的嘟嘟声，代替的是优美的音乐。
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