防护墙和既深又宽的水渠环绕着整个建筑群，它们并不是军事防护工事的一部分，而只是一种仪式上的限制隔离。
The defense wall and the deep and wide ditch surround the whole complex, not as part of a military fortification rather as a form of restricted ceremonial isolation.
这种防护墙角的填高工事在巴黎是相当普遍的。
This practice of filling up corners of the wall is much in use in Paris.
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