Of course, there are flaws in the Schengen system. Like the eurozone, the area began with only a small group of member countries, all of which had a similar outlook and capacity to implement common rules, but soon welcomed many others, some of which, it later became apparent, could not uphold agreed standards.
当然，申根体系也存在缺陷。和欧元区一样，申根区一开始也只有少数几个成员国，它们具备相似的前景和相同实施共同政策的能力。但很快申根区接纳了其他许多国家，其中一些后来显然无法遵守共同标准。