Do aerobic exercise for a minimum of four days per week, 30 minutes at a time. Some examples of aerobic exercise include running, biking and swimming.
每周至少做四次有氧锻炼，例如慢跑、骑车和游泳，每次30分钟。
The examples may work with earlier versions of Perl and UNIX and with and other operating systems, but you should consider their potential failure to function as an exercise to solve.
在较早版本的 Perl 和 UNIX 以及其它操作系统上也可以使用本文中的示例，但应当将可能的功能故障作为练习来解决。
Although these examples may work with earlier versions of Perl, Linux, and other operating systems, if they fail, their failure to function should be considered an exercise for the reader to solve.
虽然这些示例也许可以和较早版本的Perl、Linux及其它操作系统一起工作，但是如果它们不能一起工作，那么它们无法工作的原因可以作为练习，让读者去解决。
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