那就是说，卡特拉正是在一个半正规的基础上喷发的，典型的周期是每次爆发之间相隔30到80年。
That said, Katla does seem to erupt on a semi-regular basis, with typical periods between eruptions of between 30 and 80 years.
左半正规纯正半群是幂等元集形成左半正规带的纯正半群。
A left seminormal orthodox semigroup is an orthodox semigroup whose idempotents form a left seminormal band.
一张打着正规商标的床垫，出厂价只有正规商家的一半，这样的床垫你敢买吗？
A dozen wears the mattress of regular brand, the manufacturer's price only has the moiety of regular store, mattress like this do you dare to buy?
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