以下为句子列表：
英文: In this paper firstly the severity and complexity of aridity disaster among variety of natural disasters are stated; then the advances in some aspects of arid climate researches over Northwest China in past 20 years, such as its distribution features, for
中文: 摘要首先阐述了自然灾害中干旱灾害的严重性和复杂性；接着从西北干旱气候的时空分布特征、形成原因、干旱气候的比较以及监测和预测等方面回顾了近20年来我国西北干旱气候研究的进展；最后提出了西北干旱气候待研究的问题。
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英文: THE EFFECT OF ARID CLIMATE ON THE COMMUNITY STRUCTURE AND AERIAL BIOMASS OF STIPA GRANDIS STEPPE
中文: 干旱气候对大针茅草原的群落结构和地上部分生物量的影响
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