Plastic tends to discolour with age.
塑料久而久之便会退色。
The pipes were beginning to rust, discolouring the water.
管子开始生锈，水都变颜色了。
1.使变色;使褪色;污染,弄脏
2.变色;褪色,脱色
3.污染,变脏
1.to change from the original or proper colour and take on an unpleasant, faded, darkened, or dirty appearance, or make something change in this way
1.Objective: The research turns over the function of Potentilla discolour bunge(PDB) on the pancreatic islet B cells of the DM rat.
前言：目的研究翻白草对糖尿病大鼠胰岛B细胞的作用。
2.Note: The product may discolour during storage.
注：产品在存放期间可能变色。
3.The sunshine would discolour the paint.
阳光会使油漆褪色。
4.PH-neutral mount; will not discolour the picture.
PH值中性装裱纸；不会使图片褪色。
5.lor good wash clothing liquid color to stabilize , place for a long period do not discolour;
色泽好的洗衣液颜色稳定，长期放置不变色；
6.Discolour Research of Different Flowers in Suppress Process
不同类型花卉在压制过程中色变的探讨
7.Study on New Type Silver Discolour Inhibitor
新型银变色抑制剂的研究
8.scorch (vt) burn or discolour a surface by dry heat
将（物体表面）烧焦、烫糊或烫的变色