功能良好的软件绝不会假定某个服务永远可用。
Well-behaved software never assumes that a service is available at all times.
其他OS制造商，比如amiga，也将Rexx作为永远可用的系统脚本语言集成进来。
Other OS makers, such as Amiga, have also integrated Rexx as an always-available system scripting language.
实在不幸：在Perl 5中，如果不使用某些深奥而且不是永远可用的正则表达式？：修饰符，您就不能忽略选择。
Tough luck: in Perl 5, you can't ignore an alternation without the somewhat esoteric and not always available regular expression? : modifier.
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