Zhang Yijun, a Shanghai-based psychologist, says this is a common reaction.
来自上海的心理学家张怡筠说，这是一种常见的反应。
The mean foggy days of Yijun, Shiquan and xi 'an exist obvious interannual change, about quasi-period of 6, 8 years.
平均雾日较多的宜君、石泉和西安有较明显的年变化，大致有6年和8年的准周期。
The mean foggy days of Yijun, Shiquan and xi 'an exist obvious interannual change, about quasi-period of 6, 8 years.
平均雾日较多的宜君、石泉和西安有较明显的年变化，大致有6年和8年的准周期。
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