在运动过程中，心脏跳动速度增加以及呼吸变得更加急促是因为身体组织需要更多的氧气。
The reason your heart beats faster and you breath harder during exercise is because your body is trying to get more oxygen to its tissues.
在运动过程中，心脏跳动速度增加以及呼吸变得更加急促是因为身体组织需要更多的氧气。
The reason your heart beats faster and you breath harder during exercise is because your body is trying to get more oxygen to its tissues.
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