是指在进行有氧锻炼时每分钟心跳次数的范围，它能反应出锻炼者的运动强度，从而能从锻炼中获得最大的健康功效。
The number of heartbeats per minute reflecting the exercise intensity that gains the maximum training benefits from an aerobic workout.
胎儿的心跳次数是每分钟140次，是妈妈心跳的两倍。
The baby's heart beats about 140 times a minute. That's twice as fast as the mother's own heart.
测量你每分钟的心跳和呼吸次数。
Measure your heartbeats and how many times you breathe per minute.
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