yellow discolouration的用法和樣例：
例句
- The leaves of the trees begin to yellow in September.
樹葉在九月開始變黃。 - The doomed leaves pass through on their way to dingy, and yellow, and red.
葉子註定要由暗淡而泛黃，然後變紅。 - This installment and the consumables use in appraising exudes the yellow probability in the transportation and the storage process China Textile Construction Company fabric.
此裝置和消耗品用於評估在運輸和儲存過程中紡織品泛黃的概率。
