核心词议：
n. 变色；退色；变色处；退色处
discoloration 基本解释
n. 变色，褪色，污染
速记方法
知识扩展
中文词源
中文词源： discoloration
精选例句
1、 Leaves develop chlorosis;stems are short and slender,and anthocyanin discoloration occurs on stems,petioles,and lower leaf surfaces.
叶片变得萎黄，茎短而纤细，并且在茎、叶柄和叶片下表面会出现花青素变色。
常见考点例句：
- Fluorosis can cause tooth discoloration or surface irregularities .
- 氟中毒会导致牙齿变色或表面缺陷。
- The eyes and fingernails show only slight discoloration .
- 眼球和指甲仅仅只有少量的变色。
- Adverse effects include temporary skin irritation and allergy , hair breakage , skin discoloration and unexpected hair color results .
- 副作用包括短暂的皮肤刺激和过敏症、头发受损、皮肤变色和意想不到的头发颜色结果。
- Excessive sun light exposure of the root aboveground level would result in greenish discoloration near the top end due to chlorophyll photo-pigment deposition .
- 过多的太阳光照射根地面水平将导致绿色变色靠近顶端由于叶绿素光色素沉积。
- Pots can sometimes get a black film on the bottom which is almost impossible to remove ; this is caused by over-cooking or just natural discoloration due to highly acidic foods .
- 有时候锅底会出现一薄层黑色物质，很难清洗掉；这是由于过度烹煮或高酸性食品所引起的变色。
