a dull colour 暗淡的颜色
The stamp was a dark, dull blue colour with a heavy black postmark.
这枚邮票是模糊的暗蓝色的，上面盖着一个粗黑色的邮戳。
The fish looked dull in colour but otherwise appeared fine.
虽然两条鱼的颜色有些暗淡，但其他方面看起来不错。
Product Description: The Avocado, when ripe, has a dull skin colour and creamy yellow flesh.
中文描述：鳄梨熟时，暗色果皮，乳脂状黄色果肉。
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