频率 pínlǜ frequency
How to remember 频率: 频 frequency + 率 to command = frequency.
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How it is used
- Frequency (rate of occurrence, or physics) - 使用频率 (shǐyòng pínlǜ) frequency of use, 无线电频率 (wúxiàndiàn pínlǜ) radio frequency.
- A measurable rate/count per period; note 率 read lǜ here (rate).
- Contrast 频繁 (pínfán, the adjective "frequent"): 频率 is the quantity.