If the line matches the regular expression, then you print out that line.
如果该行与正则表达式匹配，则打印该行。
If the expression evaluates to true, then milestone item is considered complete.
如果这个表达式的值为true，则表示该里程碑项目完成。
One of the most common solutions to the Expression Problem is plain old if-then-else logic.
表达式问题的最常用解决方案之一是普通老式的if - then - else逻辑。
One of the most common solutions to the Expression Problem is plain old if-then-else logic.
表达式问题的最常用解决方案之一是普通老式的if - then - else逻辑。
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