预处理：未上漆表面：把墙体表面松散部位及灰尘去除。
Preconditioning: an unpainted surface: loose parts of the wall surface and dust removal.
其庞大的主体建筑极其简朴，表面是未上漆的灰色混凝土。
Its huge boxy buildings are aggressively plain, finished with unpainted gray concrete.
曲轴外延，包括前端的驱动，以及未上漆的安装导向的表面都应当刷指定的产品来进行保护。
Crankshaft extension, including front drives, and unpainted mounting pilot surfaces shall be protected by brushing on specified products.
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