名词短语
中文翻译：可变频率启动
同义词：
['Variable Frequency Starter', 'Variable Frequency Generator']
例句：
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1. The variable frequency starter is used to start the engine without using a key.
可变频率启动器用于在不使用钥匙的情况下启动发动机。
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2. The variable frequency generator can be adjusted to produce different frequencies of sound.
可变频率发电机可以调整以产生不同的声音频率。
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3. The variable frequency starter has become a popular choice for modern cars.
可变频率启动器已成为现代汽车的热门选择。