In the third and final stage, people often feel weak, tired, and out of breath-and exercise performance is severely compromised.

在第三即最后阶段，人常常感到虚弱、疲乏无力、喘不过气，运动成绩大打折扣。

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In the third and final stage, people often feel weak, tired, and out of breath - and exercise performance is severely compromised.

在第三也即最后阶段，人常常感到虚弱，疲乏无力，喘不过气，运动成绩大打折扣。

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We need oxygen for energy; without enough of it people become weak and tired.

氧是人类的动力之源——一旦缺氧，人类便会变得虚弱、易疲乏。

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