Why does the air conditioning on the train have to be so low? What's the purpose?

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Life Why does the air conditioning on the train have to be so low? What's the purpose?
2019-06-26 10:40:36 ·
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Why does the air conditioning on the train have to be so low? What's the purpose?
Tags：Train Air Conditioning, Air Conditioning Lower, Train Air Conditioning Common Sense
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