设F是任一子群闭的局部群系，利用极小子群的F超中心性，给出一类可解群属于F的一个充分条件，由此得到一些群的结。

Using the F hypercenter of minimal subgroups, this paper gives a sufficient condition under which a soluble group belongs to a given formation F.

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严格意义上来说她坐月子并不是在家里，而是在一家医院的超豪华监护中心，每天花费达500美元。

Instead of being at home, she went straight from the hospital to a superluxury confinement center that costs around $500 a day.

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安德森走进安全中心——一个配备了连接着电脑显示器的超现代设备的狭小空间。

Anderson walked into the security nerve center—a compact, neomodern facility packed with computer monitors.

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