还有人停留数天数星期来欣赏公园。
您会发现为特定的可用性场景选择小时、分钟、天数或星期十分有用。
You may find it useful to select hours, minutes, days, or weeks for your particular availability scenario. Run the extractEmails.pl
静态字段并不理想，但是当常数值不可能更改(例如一星期内的天数)时，也可以使用这种方法。
Static fields aren't ideal but are reasonably painless when the value of the constant isn't likely to change — such as the values for the days of the week.
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