Idiom Magic : (AS) PURE AS THE DRIVEN SNOW 純潔無瑕的; 道德高尚的

【明報專訊】Driven snow is new, clean(清潔的)white snow blown (driven) by the wind. It's not yet dirty. From that, when someone is said to be (as) pure as the driven snow he — or she — is a very good and moral(道德的)person. "There! Our new friend is as pure as the driven snow," Jaime laughed.