工程师们设计了一个粗糙的原型来测试基本概念。

The engineers designed a ___crude prototype to test the basic concept.

瞥了一眼建筑物粗糙的平面图，我意识到我别无选择，只能搜索每个房间。

Glancing at the ___crude plan of the building, I realised I had no choice but to search every room.

参加研讨会后，她粗糙的雕刻技术有了显著提高。

Her ___crude carving techniques improved significantly after attending a workshop.