照片 URL 将所有评论合并在一起，因此改变照片的 URL 是不允许的。
The photo URL unites all the comments, so changing the photo URL will not be allowed.
改变值的赋值被叫做破坏性赋值，是不允许的。
Any assignment that changes a value is called a destructive assignment and is not permitted.
但是细菌修复法——即将细菌通过一种可除去的凝胶涂于作品的表面——不允许水分穿过或者改变绘画作品的其他层。
But the bacteria treatment, placed on the works' surfaces via a removable gel, did not allow moisture to penetrate or alter other layers of the paintings.
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