每日口說挑戰 【TED-Ed】氧氣是怎麼在身體裡循環的？ (How oxygen travels through your body - Enda Butler)

今日挑戰句子

If our lungs were shaped like balloons, air that was not in direct contact with the balloon's inner surface couldn't diffuse through. Luckily, our lungs' architecture ensures that very little oxygen is wasted.

如果我們的肺形狀就像氣球，那些沒有跟氣球面直接接觸到的氧分子就無法擴散通過。幸好，我們肺的結構可以確保只有一些些氧氣會被浪費掉。