Phrase
extremely low frequency
noun
极低频；3到30赫兹的无线电频带
the band of radio frequencies from 3 to 30 hertz
- 1.
The band of radio frequencies from 3 to 30 hertz.
3到30赫兹的无线电频率带。
3到30赫兹的无线电频率带。；极低频；[电] 至低频
In use
Extremely low frequency is difficult to generate because the antenna must be extremely large.
Some researchers record extremely low frequencies to study lightning activity around the world.
Radio receivers for extremely low frequency are usually built far from cities to reduce interference.
the [target]
用作主语或宾语。
The extremely low frequency interferes with the signal.
极低频干扰信号。
[target] + [noun]
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。
at [target]
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。
Common mistakes
An extremely low frequency is used for submarine communication.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'。
Extremely low frequencies are studied in geophysics.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。
Connections
Confusing words
- very low frequency
- 甚低频 · 极低频（ELF）指3-30 Hz，甚低频（VLF）指3-30 kHz，频率范围不同。
- low frequency
- 低频 · 极低频（ELF）的频率低于低频（LF），ELF为3-30 Hz，LF为30-300 kHz。
Word family
- low-frequency
- 低频的 · adj.
- frequency
- 频率 · n.
- high-frequency
- 高频的 · adj.
- frequent
- 频繁的 · adj.
Learner notes
Learn the forms together
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.