留美老師帶你每日說英文第782期:肺中的氧氣

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臺灣籍旅美老師今天交給我們的句子是：

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.
如果我們的肺的形狀像氣球，那麼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很少的一些氧氣會被浪費掉。