Paintings must have rigid stretchers so that the canvas will be taut, and the paint must not deteriorate, crack, or discolor.
画必须有坚硬的画架，这样画布才会绷紧，而且颜料不能变质、开裂或变色。
They teach farmers, gardeners, and other plant growers how to fight viruses that can ruin a valuable crop or discolor a beautiful landscape.
同时传授农民、园艺工人和其他栽培人员如何对抗那些摧毁珍贵作物和美丽风景的病毒。
Black matte enameled interior does not discolor or rust and gets better with use.
黑色磨砂漆包线内部不褪色或生锈，更好的获取与使用。
Black matte enameled interior does not discolor or rust and gets better with use.
黑色磨砂漆包线内部不褪色或生锈，更好的获取与使用。
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