本文以定西地区为例，对作物生产与自然降水、作物生产与土壤肥力以及土肥生产效应等方面进行了研究。
Based on Dixi district, the study of crop yields and precipitation, crop yields and soil fertility and soil fertility effects has been mabe.
根据北方农牧交错带（定西县1970～2000年）的气候资料，分析了该地区30年来气候变化周期、趋势及其草地气候生产力的变化。
According to climate data(1970~2000) in the northern farming and pastoral area, the climate change cycle, trend and grassland climate productivity about 30 years were analyzed.
这座应急性方舟是在假定西南极地区的冰架融化的情况下设计的，因为如果这样的话，很多城市，包括迈阿密都会深埋海底。
The Contingency Ark was designed under the assumption that the West Antarctic ice shelf will melt and a great number of cities, including Miami, will be underwater.
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