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The trace showed a normal heart rhythm.
We all know that when we exert ourselves our heart rate increases.

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