建筑师的初步草图勾勒了这座宏伟博物馆的大致轮廓，但内部细节尚未确定。
The architect's preliminary sketch was meant to adumbrate the grand museum but left the interior details undefined.
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解释
勾勒轮廓、概述 — to give a rough outline or sketch of
The architect's preliminary sketch was meant to adumbrate the grand museum but left the interior details undefined.
勾勒轮廓、概述 — to give a rough outline or sketch of