n.变色，退色，变色处，退色处

The silverware had developed a greenish discoloration from long exposure to air.
这些银器因长期暴露在空气中而产生了绿色斑点。
The old book had yellowed with age, showing signs of discoloration on the pages.
那本旧书因年代久远而泛黄，书页上显露出斑驳的痕迹。
Regular cleaning can prevent soap scum and water stains causing discoloration in your bathroom tiles.
定期清洁可以防止皂垢和水渍导致浴室瓷砖变色。
Sunscreen should be applied daily to avoid skin discoloration caused by excessive sun exposure.
应每天使用防晒霜以避免过度暴晒引起的皮肤色素沉着。
The wood floor had a beautiful patina, but there was some discoloration around the edges.
木地板有一种美丽的光泽，但边缘有些变色。
The antique vase had a delicate blue-and-white pattern, but it showed minor discoloration in some areas.
这只古董花瓶有精美的青花图案，但在某些部位有轻微的褪色。
To remove the ink stain, gently rub the affected area with an alcohol-based cleaner until the discoloration disappears.
要去除墨水污渍，请用含酒精的清洁剂轻轻擦拭受影响区域，直到颜色褪去。
The artist used various shades of brown paint to create a realistic-looking tree trunk with natural discolorations.
艺术家使用不同深浅的棕色颜料绘制了一根逼真的树干，带有自然的斑驳效果。
Over time, the leather sofa began to show discoloration due to frequent use and sunlight exposure.
随着时间推移，皮质沙发由于频繁使用和阳光照射开始出现变色现象。
The swimming pool's water had turned cloudy due to algae growth, which indicated a need for chemical treatment to prevent further discoloration.
游泳池里的水因为藻类滋生变得浑浊，这表明需要进行化学处理以防止进一步的变色。