内部经过粉刷但未油饰。

The interiors were plastered but not painted.

磨砺内心比油饰外表要难得多，犹如水晶与玻璃的区别。

Grinding your heart to an iron one is far more difficult than decorating your appearance. its difference is like that between crystal and glass.

木基材含水率直接影响到地仗层与油饰彩画层结构的稳定性，含水率过高将导致地仗开裂、空臌、剥落等。

Wood moisture contents directly affect the structure stability of plaster and painting and colored drawing. For example, excessive wood moisture will lead plaster to cracking and spalling.