The paper analyzes the effect of rotation and fertilization on alfalfa productivity on the Loess Plateau based on a long-term experiment.

在长期定位试验的基础上，分析黄土高原地区轮作与施肥对苜蓿生产力的影响。

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"Sixteen years counts as a long term experiment," explains Russell Hand of the University of Sheffield in England.

“16年就已经算是长期的实验了，”英国谢菲尔德大学的拉塞尔•汉德解释说。

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On Thursday, a week later, it inched further toward a long-term deal with Google because the companies are pleased with the initial results of the experiment, according to The Wall Street Journal.

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