Eight breaths per minute or less is considered slow.

判断标准为每分钟呼吸次数等于或少于八次就为偏慢呼吸。

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We know that for most people their resonant frequency is between 7.5 and 4.5 breaths per minute.

我们知道对大多数人来说，他们的共振频率介于每分钟4.5次至7.5次呼吸之间。

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Cyclists breathed more frequently and took more deep breaths than car passengers. They breathed in and out about 4.3 times more air per minute than car passengers.

骑行时的呼吸频率和深度均远超乘车时，前者每分钟的呼吸量是后者的4.3倍。

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The study found the wireless network could measure breathing within 0.4 to 0.2 breaths per minute, an insignificant error rate given that most breathing monitors round to the nearest breath per minute, he says.

ENGADGET: Researchers use wireless network to monitor breathing, could save lives

When his staff gassed mice with hydrogen sulfide at a fraction of the lethal dose for humans, their body temperatures plunged, all movement stopped, and their breathing slowed to just a few breaths per minute.

FORBES: Magazine Article

We hooked a breathing tube up to a hose from a ventilator and set it to give him fourteen forced breaths of a hundred-per-cent oxygen every minute.

NEWYORKER: The Checklist