导致沙漠化的主要因素有四个：过度种植、过度放牧、过度砍伐、过度灌溉。
Four specific activities have been identified as major contributors to the desertification processes: overcultivation, overgrazing, firewood gathering, and overirrigation.
导致沙漠化的主要因素有四个：过度种植，过度放牧，过分砍伐，过度灌溉。
Four specific activities have been identified as major contributors to the desertification processes: overcultivation, overgrazing, firewood gathering, and over irrigation.
加拿大魁北克的政府阻止人们将这种植物卖给企业，以保护这种植物不被过度挖掘。
Government in Quebec, Canada, stopped people selling the plant to businesses in order to protect the plant against being over dug.
这些措施包括减少果树的种植数量以防止土壤过度开垦；如何安排时间播种；给果树剪枝以获取足够的阳光；以及给树木适量浇水。
These include growing fewer trees to prevent overuse of soil, how to time planting of seeds, pruning to allow enough sunlight onto plants, and supplying trees with appropriate amounts of water.
上周，我们讨论了如何在局部的阳光下种植蔬菜。这周，我们将要学习如何避免植物过度受到光照。
Last week we discussed how to grow vegetables in partial sun. This week we learn how to protect vegetables from too much sun.
最后，种植基因改良树木可以减少对野生树木的过度开发。
Finally, the use of genetically modified trees can prevent overexploitation of wild trees.
而种植苜蓿样地等节跳虫科个体密度最大，其大小是过度放牧样地等节跳虫科的 3.33倍。
At sites of the planting alfalfa treatment, the individual density of Isotomidae reached 3.33 times of over grazing treatment.
而种植苜蓿样地等节跳虫科个体密度最大，其大小是过度放牧样地等节跳虫科的 3.33倍。
At sites of the planting alfalfa treatment, the individual density of Isotomidae reached 3.33 times of over grazing treatment.
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