Katla seems to erupt on a semi-regular basis, with typical periods between eruptions of between 30 and 80 years.
卡特拉似乎是半规律地喷发的，典型的周期是每次爆发之间相隔30到80年。
Full system backups are good things in their own right, and I hope you back up your system on at least a semi-regular basis.
全系统备份本身就是很好的主意，我希望您不定期地对系统进行备份。
Locany S-Closed Space is extremally disconnected if and only if every semi-regular S-closed set relative to X is Closed set.
本注记给出局部S-闭空间X是极不连通的充要条件是X中每个相对X是S-闭的半正则于集是闭集。
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