经济性准则：和机器的时间比较，程序员的时间是更宝贵程序员经济性比较的。
Rule of Economy:Programmer time is expensive; conserve it in preference to machine time.
译：经济性准则：程序员的时间是宝贵的，用机器时间来保护程序员的时间，即如果和机器时。
Rule of Economy: Programmer time is expensive; conserve it in preference to machine time.
选择空压机的基本准则是经济性、可靠性与安全性。
Choose air compressor is the basic rule of economy, reliability and security.
选择空压机的基本准则是经济性、可靠性与安全性。
Choose air compressor is the basic rule of economy, reliability and security.
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