以下为句子列表:
英文: Experts say, observation statistics and researches of 13 years show that the frequency of acid rain in Beijing-Tianjin-Hebei region and part of Henan province has increased by over 20% to 50% ever since 2003, with a more noticeable acidification tendency
中文: 专家介绍,13年来的观测数据和研究资料显示,2003年以来,包括北京在内的京津冀地区及河南部分地区的酸雨发生频率增加了20%到50%以上,而北京的雨水酸化趋势更是明显,并出现了强酸雨。
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英文: Spatial-temporal changes in vegetation cover and their relationships with precipitation and surface air temperature over the Beijing-Tianjin-Hebei region from 1982 to 2006
中文: 1982—2006年京津冀地区植被时空变化及其与降水和地面气温的联系
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