它的优点是能在Linux和多数其它操作系统下编译，并且在版权保护下可公开获得，只要您作出例行的承认并报告错误。
It has the virtue of compiling under Linux and most other operating systems, and is openly available under copyright, provided the customary acknowledgment is observed and errors are reported.
计算机（ 例行） 程序内的一次操作。
为了保持设备正常操作，必须进行例行维修保养。
In order to maintain the equipment in good work order, it's necessary to carry out routine maintenance.
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