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近几年来“负离子”这个词在广告中、商品中、报纸上,电视上都频频出现,那么,什么是负离子呢?它到底有什么神奇之处呢?
In recent years, the word “negative ions” appears frequently in advertisements, goods, newspapers and on television. So, what is negative ions? What is the magic behind it?