教授简要描述了历史背景。
The professor provided a brief ___sketch of the historical context.
我已为您审阅准备了拟议项目的初步概要。
I have prepared a preliminary ___sketch of the proposed project for your review.
她的报告只是对复杂问题的简要描述,缺乏深入分析。
Her report was merely a ___sketch of the complex issue, lacking in-depth analysis.