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speed
There are data on the rates of diffusion of molecules.
His pulse rate dropped suddenly.

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Open the tool →速率 (sù lǜ) means “rate, speed”.
速率 is pronounced sù lǜ in Mandarin Chinese.
“rate” is 速率 (sù lǜ) in Chinese.
This page has 2 example sentences using 速率, each with pinyin and an English translation.