给出了布尔群代数半群中的幂等元、极大子群和正则元的结构以及幂等元和正则元的个数。
The structure of the idempotent elements, regular elements and maximal subgroups and the number of the idempotent elements and regular elements in Boolean group algebra are given.
在摩洛哥的阿特拉斯山脉，研究人员发现了另一处保存有丰富的动物软体组织的的化石群，它的形成年代紧跟布尔·吉斯化石群之后。
In an area of the Atlas Mountains of Morocco the researchers have found another diverse (and sometimes bizarre) assemblage of soft-bodied organisms from a period not long after the Burgess Shale.
金布尔太太在学生群中不见了，茱莉亚他们也全走出了校园。
Mrs. Kimble was lost in the student population so they started to walk out of the school yard without Mrs. Kimble.
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