本文介绍了电话和电子设备中两种重要的声音信号——tone和beep。tone通常指电话或答录机发出的信号音，如忙音，提示线路已被占用。而beep则指短暂的高音，常见于汽车喇叭或电子设备提示。了解这些声音信号对于日常通信和技术支持至关重要。
tone/təʊn/noun
countable.
a sound made as a signal by a machine (such as a telephone or answering machine)
Hello, you've reached the voicemail of Leonard. I'm not available right now, so please leave a message after the tone.
(Brit) I keep getting the engaged tone. (US) Busy signal; . the sound which points that the telephone line is already used.
Other volunteers reported being unable to get through to technical support and found themselves receiving either a busy signal or a try again later message.
beep /biːp/
noun countable.
a short high sound such as that made by a car horn or by electronic equipment.
Please leave a message after the beep. We'll reach you later.
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