Dynamic characteristics of collaborated system mainly include natural vibration frequency and principal mode, which is the base and precondition of dynamic analysis for collaborated system.

协作体系的动力特性主要包括体系的自振频率和主振型，它是协作体系结构动力分析的基础和前提。

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Once this principal has been set, you can simply use the JEE security model and WebSphere Base Security APIs as you normally would.

一旦对这个 principal 进行了设置，您就可以像往常那样使用 JEE 安全模型和 WebSphere Base Security API。

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The bony vault is the principal structural base for the nose.

骨拱是鼻的主要基础结构。

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Ngobongue called AQIM's "principal base" somewhere in Mali's north.

WSJ: Chad Army Says It Killed Key Terrorists

Real democracy has never thrived here, at least in part because the landowning class remains the principal social base from which politicians emerge.

NEWYORKER: Days of Rage

By a process which Ms Freeland describes in fascinating detail, the Yeltsin government all but gave away much of Russia's productive base to the seven principal oligarchs, in return for which his presidential election campaign was generously bank-rolled.

ECONOMIST: Observing Russia