1
the [target]
用作主语或宾语。
The extremely low frequency interferes with the signal.
极低频干扰信号。
极低频；3到30赫兹的无线电频带
先理解核心含义，再看它在真实句子里的用法。
极低频；3到30赫兹的无线电频带
the band of radio frequencies from 3 to 30 hertz
The extremely low frequency interferes with the signal.
极低频干扰信号。
3到30赫兹的无线电频率带。
The band of radio frequencies from 3 to 30 hertz.
Extremely low frequency is difficult to generate because the antenna must be extremely large.
极低频很难产生，因为所需的天线必须非常大。
Some researchers record extremely low frequencies to study lightning activity around the world.
一些研究人员记录极低频，以研究世界各地的闪电活动。
Radio receivers for extremely low frequency are usually built far from cities to reduce interference.
用于极低频的无线电接收机通常建在远离城市的地方以减少干扰。
用作主语或宾语。
The extremely low frequency interferes with the signal.
极低频干扰信号。
用作定语修饰名词。
Extremely low frequency waves penetrate the ocean.
极低频波可以穿透海洋。
表示在某个频率下。
The device operates at extremely low frequency.
该设备在极低频下运行。
Not this
An extremely low frequency is used for submarine communication.
Use this
Extremely low frequency is used for submarine communication.
极低频作为一个现象是不可数名词，不应加不定冠词'an'。
Not this
Extremely low frequencies are studied in geophysics.
Use this
Extremely low frequency is studied in geophysics.
极低频特指一个频段，通常作为单数不可数名词使用；复数形式会误指多个不同的频段。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use extremely low frequency naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.