这可能需要几天时间的练习来掌握。
Remember it might take a few days of practice to get the hang of it.
Perl使数字和字符串之间的转换易于进行，但是这可能会产生一些需要几小时或几天才能发现的小故障。
Perl makes it easy to convert Numbers into strings and vice versa, but that can create subtle bugs that take hours or days to find.
这可能需要几个小时或几天才能恢复。
It make take a few hours or a few days before it is back up again.
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