示例可以与早期版本的 Perl 和 UNIX 以及其它操作系统一起使用，如果它们不能工作，对您来说，可以把它当成练习来解决。
The examples may work with earlier versions of Perl and UNIX, as well as with other operating systems, but their failure to function should be considered an exercise for you to solve.
哪一个游戏值得如此不断地反复练习与操作，玩到这样如火纯青的娴熟程度呢？
Is any game worth playing supremely well, at the price of constant practice and application?
培养好个性的决定因素，就是借由练习与重复操作学习好习惯。
The decisive factor in developing a great character is to learn good habits through practice and repetition.
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