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1·Paintbox is a small box containing dry paint that you mix with water.

颜料盒是一个装有干颜料的小盒子，你可以将干颜料与水混合使用。

2·The author even regrets the removal from the paintbox of rich greens based on arsenic and flame-red vermilion formed from powdered mercuric sulphide.

甚至让笔者感到遗憾的是含砷的浓绿色和粉状硫化汞制成的火焰般红色的朱砂从颜料盒中消失了。