Tracing to its source to join us in 12, the 13th century and "Crusades" period, the serfs continue to participate in the east to give up farmland, to feudalism in order to deal a heavy blow.
我们一起追根溯源到12 、13世纪和“十字军东侵“时期，参加东征的农奴不断放弃农田，给封建主义以沉重的打击。
The regularity, durativity, normality and harm of drought in semiarid region on the Loess Plateau, result in the complexity and hardness to deal with in farmland drought management.
黄土高原半干旱地区干旱发生的经常性、持续性、广泛性和危害性，决定了解决农田抗旱问题的复杂性和艰巨性。
The speaker owes the world food crisis to the climate change, the loss of farmland and the production of biofuels, and urges us to take measures to deal with this crisis.
演讲人将世界食物危机归究于气候变化、耕地减少和生物燃料的生产，敦促我们采取措施应对这一危机。
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