"又略举事目,年经国纬以备检寻,为目录三十卷" 的翻译可以是:

"Moreover, a brief list of events is compiled, organized chronologically by national contexts for easy reference, forming a catalog in thirty volumes."
"优略" can be translated as "brief" or "abridged," indicating a summary or a concise version of something. In this context, it might refer to the brevity or conciseness of the directory's presentation.
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