By the time you turn 70, your heart will have beat some two-and-a-half billion times (figuring on an average of 70 beats per minute.)
到70岁时，你的心脏已经跳动25亿次(假设平均每分钟跳动70次)。
By the time you turn 70, your heart will have beat some two-and-a-half billion times (figuring on an average of 70 beats per minute.)
到70岁时，你的心脏已经跳动25亿次(假设平均每分钟跳动70次)。
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