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The far-infrared rays radiated by the negative ion mineral crystals are well coordinated with the human body and can be fully absorbed by the human body. For each positive and negative ion, its lifetime is short-lived and generally only exists for tens of minutes. The amount of negative ions in the air is affected by the specificity of the geographical conditions. There are more parks, suburban fields, seashores, lakes, waterfalls and forests. Therefore, when people enter the above venue, their minds are fresh, and their breathing is refreshing and refreshing.