Scientists think this is the plants' way to prevent the spread of any tree diseases and make life more difficult for leaf-eating insects like caterpillars.
科学家认为，这是植物防止树木疾病传播的方法，并给像毛毛虫之类的食叶昆虫制造些生存上的困难。
This would prevent business executives from using the easily-obtained permits as a back-door to work, rather than obtaining more expensive or difficult visas.
这将阻止投机者们拿一个容易取得的许可证作为一个后门来工作，而不是通过正当方式获取较昂贵或较难办理的签证来工作。
This would prevent business executives from using the easily-obtained permits as a back-door to work, rather than obtaining more expensive or difficult visas.
这将阻止投机者们拿一个容易取得的许可证作为一个后门来工作，而不是通过正当方式获取较昂贵或较难办理的签证来工作。
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