该文件允许一球前进一格，但球会不尊重和对角移动，现在你可以使用数字键盘。
This file allows a ball to move on a grid but the sphere respect and will not move diagonally and now can you use the num pad: -...
例如，实际上如果不允许一个程序从文件系统进行读和写，很难测试它是否正确使用了该文件系统。
For example, it is difficult to test whether a program is making proper use of the filesystem without actually allowing it to read and write from the filesystem.
每个 URL 在 XML 文件中都存在一个条目，该文件只允许强制输入 URL 引用本身。
The XML file contains one entry for every URL and the only mandatory input is the URL reference itself.
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