常見例句雙語例句Lack of water resource has become a critical problem faced by China northwest regions and the other arid and semiarid regions in the world.水資源短缺已成為我國西北地區(qū)乃至世界上其他干旱半干旱地區(qū)需要面對的一個重大問題。This paper summarized hydrological characters, distribution of precipitation and runoff in arid and semiarid regions in the northwest of China on the basis of the previous researches.本文在前人研究基礎(chǔ)上，總結(jié)了中國西北部干旱半干旱地區(qū)的水文特性，降水及徑流的時空分布規(guī)律。 返回 northwest semiarid regions