unazotized

例句：

1. 1. The steel was unazotized before it was used in the bridge.
   这座桥使用前，钢材是未被腐蚀的。
2. 2.The antique vase is unazotized and shows no signs of wear.
   这个古董花瓶未被氧化，看起来没有磨损的痕迹。
3. 3. The paint on the old house was unazotized, making it look new again.
   旧房子上的油漆未被酸化，让它看起来焕然一新。