The aim of said invention is to obtain oxygen and nitrogen effectively with low energy consumption.

本发明的目的在于低能耗地、紧凑地、高效地获取氧气和氮气。

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When walking the calf muscles need more oxygen, but because the blood flow is restricted the muscles cannot obtain enough oxygen from the blood and cramp occurs.

走路时小腿肌肉需要更多氧气，但因为血液流动被限制，肌肉就无法获得足够的氧气，进而产生痉挛。

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The device is intended to help emergency medical providers with minimal training to deliver oxygen to patients with results similar to those a hospital surgeon might obtain.

该设备的目的是帮助那些只进行过最基本培训的急诊医务人员，使他们能像那些医院里的外科医生一样为病人提供氧气。

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It also found he failed to provide the patient with oxygen, and that he falsely informed the air support paramedics that he was unable to obtain a radial pulse when he never attempted to do so.

BBC: Paramedic suspended after life support machine blunder