He showed us a crude sketch of the building.
他给我们看了那栋建筑物的粗略的草图。
It is a sketch of that building.
这是那栋建筑物的草图。
This sketch of the building ought to be corrected immediately.
大楼的这张图纸应该马上修改。
When I was satisfied with the sketch, I started work, building up the clouds.
当我对构图比较满意了，我开始构造云层。
When I was satisfied with the sketch, I started work, building up the clouds.
当我对构图比较满意了，我开始构造云层。
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