This type of study design, known as "case-control," cannot prove cause-and-effect.
这种类型的研究被称为病例对照研究，它不能够证明两者之间的因果关系。
It should be provided with science significance and practice worthiness that to carry out study on the desertification cause, process, endanger, trend and control.
开展沙漠化的研究，探讨其成因、过程、危害和发展趋势，为防治提供理论依据，是有很好的科学意义和实践价值的。
By study the influence of transport distance and pig pre-slaughter rest on the ponderance and probability of PSE pork, try to find out the main cause and effective control means of PSE pork.
通过研究运输距离和宰前静养对PSE猪肉产生几率及严重度的影响，找出产生PSE猪肉的主要原因以及有效控制措施。
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