三是空氣中的氧含量下降會讓我們的大腦出現懈怠，而發生昏昏欲睡。這時如果

三是空氣中的氧含量下降會讓我們的大腦出現懈怠，而發生昏昏欲睡。這時如果躺下來休息一會兒，可以緩解下雨前胸悶的感覺。

結果 (英文) 1:

Third, the oxygen content in the air will drop our brains appear slack, and sleepy occur. Then if lie down and rest for a while, before the rain can ease the feeling of chest tightness.

結果 (英文) 2:

Third, the drop in oxygen levels in the air will make our brains slack and drowsiness. At this time, if you lie down to rest for a while, can relieve the feeling of chest tightness before rain.

結果 (英文) 3:

Third, the decrease of oxygen content in the air will make our brain slack and drowsy. At this time, if we lie down and rest for a while, it can alleviate the feeling of chest tightness before rain.