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Why do pigs like mud?

作者:21ST
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为什么猪爱在泥地里打滚?

Mud keeps pigs cool in the summer. Pigs have big and fat bodies. They get very hot when it’s warm. But pigs can’t sweat (流汗), so they stay in mud to keep cool. Pigs also use mud baths4 to keep bugs5 away.
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