名词
中文翻译：可变音调蜂鸣器
同义词：
['variable-frequency buzzer', 'variable-frequency generator']
例句：
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1. This variable-note buzzer is used to signal when the temperature drops below a certain level.
这个可变音调蜂鸣器用来指示温度降到一定水平以下时发出信号。
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2. The variable-note buzzer was designed to help people stay alert during long flights.
可变音调蜂鸣器被设计来帮助人们在长时间的飞行中保持警觉。
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3.The variable-note buzzer can be adjusted to emit different frequencies, depending on the needs of the user.
可变音调蜂鸣器可以根据用户的需求调整发出不同频率的声音。