值得怀疑的是，如果将一个目录结构组合成单个的文件，不管压缩与否，是否对于每个系统都可行呢？
It is questionable whether combining a directory structure into a single file, compressed or not, is a viable option for every system.
此外，它的分层结构也保证了它是一个可行的系统。
Moreover, its layered structure can also ensure it's a practical system.
联合使用HTML元素和CSS创建一个树形结构是可行的。
It's possible to use a combination of HTML element and CSS to create a tree structure.
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