It's not unusual for cold air to ca

It's not unusual for cold air to cause spasms in the lung airways, making it harder to breathe. ... It will warm the air that you take into your lungs, which will keep your airway open.

Results (Chinese) 1:

这是不寻常的冷空气在肺气道痉挛的原因，使其难以呼吸。......它会温暖你需要进入你的肺部，这将让你的呼吸道通畅的空气。

Results (Chinese) 2:

冷空气在肺气道引起痉挛，使呼吸更加困难，这是不平常的。...它会温暖你带进肺部的空气，让你的气道保持畅通。

Results (Chinese) 3:

冷空气导致肺气道痉挛，呼吸困难，这并不罕见。... 它会使你吸入肺部的空气变热，从而保持呼吸道畅通。